Question

It is an election year, and a volunteer asks if jay would put a small sign in his yard. he agrees. the next week, jay's wife cannot believe he agreed to put a 3-foot sign on the front lawn. this scenario is explained by:

Answer 1

I believe the answer is: the foot-in-the-door phenomenon

the foot-in-the-door phenomenon refers to a persuasion technique to make someone agree to do a big favor by making that person do a small favor first.
Other examples of the foot-in-the-door phenomenon would be when girl scout sell you a small candy first and ask you to buy a subscription after you purchase the candy.