4. PART B: Which detail from the paragraph provides the best clue to the meaning of the word "curb" as it is used in this context?
A "increased"
B "successfully avoided"
C "pushing the button
D "react inappropriately"

Aman lives on the twelfth floor of an apartment building. every morning he takes the elevator down to the lobby and leaves the building. in the evening, he gets into the elevator, and, if there is someone else in the elevator -- or if it was raining that day -- he goes back to his floor directly. otherwise, he goes to the tenth floor and walks up two flights of stairs to his apartment.