Look up any of his books and check out his word play
C. Because he explains what to do to Ernesto and his mother.
The answer is the second one, B. The other ones are obviously opinions, and the only one that comes close is C. However, many people have different ideas about how things should be handled by citizens, making C incorrect.
21 - discover
22 - ancient
23 - imagination
24- information
25- historians
That means to choose a topic based on the information that was in the unit.