One of the negatives of the human tendency to conform is that _______.（ ） A: it can make people not think about the rational basis of certain behaviours. B: it makes people feel more comfortable with others. C: it provokes people to come up with "crazy ideas". D: it makes people feel bored with life.

The central idea is __________. A: A declarative sentence that tells what you hope to accomplish with your speech B: A declarative phrase you want your audience to remember in your speech C: A single infinitive phrase that indicate what you want to accomplish with your speech D: An interrogative sentence that provokes the audience's curiosity and interest