Suppose You Are Trying to Persuade a Group of People

Suppose you are trying to persuade a group of people to purchase a new kitchen gadget.If you are presenting mostly weak arguments, which of the following techniques would help people feel more confident in their attitudes?

A) getting people to applaud
B) asking them "yes" questions to get them to nod their heads
C) using a cognitive approach
D) asking them "no" questions to get them to shake their heads