Answer:
A. What locations are best for growing a school garden?
Step-by-step explanation:
The question "What locations are best for growing a school garden?" it is the only one that directly refers to the establishment of a school garden. For this reason, we can say that with this question the author of the book would be able to quickly reach the audience he wants to reach, since he raises a common and recurring thought in people who want to create a school garden.