Of these research projects, which is the best choice for a student who is interested in environmental issues to study?
making cars run on less fuel finding more sites for copper mines making ocean liners bigger and faster replacing human workers with robots
Question: Of these research projects, which is the best choice for a student who is interested in environmental issues to study?
A. making cars run on less fuel
B. finding more sites for copper mines
C. making ocean liners bigger and faster
D. replacing human workers with robots
Answer: