Which of the following fact patterns most clearly suggests an implied-in-fact contract?
A county tax assessor mistakenly bills Algernon for taxes on Bathsheba's property, which Algernon, in good faith, pays.  Meddick, a physician, treated Ryder without Ryder's knowledge or consent, while Ryder was unconscious as the result of a fall from his horse.  Asphalt, thinking that he was paving Customer's driveway, for which Asphalt had an express contract, mistakenly paved Nabor's driveway while Nabor looked on without saying anything or raising any objection.  At her mother's request, Iris, an accountant, filled out and filed her mother's "E-Z" income-tax form (a simple, short form). 
Question: Which of the following fact patterns most clearly suggests an implied-in-fact contract?
A. A county tax assessor mistakenly bills Algernon for taxes on Bathsheba's property, which Algernon, in good faith, pays. 
B. Meddick, a physician, treated Ryder without Ryder's knowledge or consent, while Ryder was unconscious as the result of a fall from his horse. 
C. Asphalt, thinking that he was paving Customer's driveway, for which Asphalt had an express contract, mistakenly paved Nabor's driveway while Nabor looked on without saying anything or raising any objection. 
D. At her mother's request, Iris, an accountant, filled out and filed her mother's "E-Z" income-tax form (a simple, short form). 
Answer: