Our little boy came up to his mother in the kitchen one evening while she was preparing supper, and handed her a piece of paper that he had been writing on. After his mom dried her hands on her apron   , she read it, and this is what was said: For going to the store for you $2. For cutting the grass in the garden $3. For cleaning up the yard this week $2.5. For cleaning up my room this week $2. For setting the table for meals this week $1. For baby-sitting my kid brother while you went shopping $1.5. For getting a good school report $5. Total owed: $17. His mother looked at him, who was standing there with expectation. Memories flashed through her mind. Then she picked up a pen, turned over the paper he had written on, and wrote: For the nine months I carried you while you were growing inside me, No Charge  .  For all the nights that I've sat up with you and taken care of you, No Charge. For all the problems and troubles that you've caused through the years, there is No Charge. When you add it all up, the cost of my love is No Charge. For all the nights that were filled with fear and for the worries I knew were ahead, No Charge. For the toys, food, clothes, and even wiping up your nose? There is No Charge. And when you add it all up, the full cost of real love is, No Charge, Son. Well, friends, when our son finished reading what his mother had written, there were big tears in his eyes, and he looked straight up at his mother and said, "Mom, I sure do love you.." And then he took the pen and in great letters he wrote, " PAID IN FULL." This story tries to tell us that   _  .
real love is priceless housework is endless the mother is wise the boy is selfish
Question: Our little boy came up to his mother in the kitchen one evening while she was preparing supper, and handed her a piece of paper that he had been writing on. After his mom dried her hands on her apron   , she read it, and this is what was said: For going to the store for you $2. For cutting the grass in the garden $3. For cleaning up the yard this week $2.5. For cleaning up my room this week $2. For setting the table for meals this week $1. For baby-sitting my kid brother while you went shopping $1.5. For getting a good school report $5. Total owed: $17. His mother looked at him, who was standing there with expectation. Memories flashed through her mind. Then she picked up a pen, turned over the paper he had written on, and wrote: For the nine months I carried you while you were growing inside me, No Charge  .  For all the nights that I've sat up with you and taken care of you, No Charge. For all the problems and troubles that you've caused through the years, there is No Charge. When you add it all up, the cost of my love is No Charge. For all the nights that were filled with fear and for the worries I knew were ahead, No Charge. For the toys, food, clothes, and even wiping up your nose? There is No Charge. And when you add it all up, the full cost of real love is, No Charge, Son. Well, friends, when our son finished reading what his mother had written, there were big tears in his eyes, and he looked straight up at his mother and said, "Mom, I sure do love you.." And then he took the pen and in great letters he wrote, " PAID IN FULL." This story tries to tell us that   _  .
A. real love is priceless
B. housework is endless
C. the mother is wise
D. the boy is selfish
Answer: