Answer:
d. spend as much time developing the mind as developing the body.
Step-by-step explanation:
In this excerpt, the author wants to persuade the reader to devote as much time developing the mind as he or she does developing the body. The author tells us that as humans, we spend an enormous amount of time tricking the body in several ways, such as being full. We employ many people, from the milkman to the pig-killer, in order to satisfy this desire. However, we need no outside help to develop the mind, and this is a much more delicate machine. Therefore, it requires just as much attention.