Which of the following is true about writing an argumentative essay? A. The author should maintain a persuasive tone and formal style.
B. The author should maintain a persuasive tone and informal style.
C. The author should maintain an objective tone and formal style.
D. The author should maintain an objective tone and informal style.

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.