Which of the following sentences uses the word "assumption" correctly? (3 points)

the assumption kelly was working on ended when school began and she had to spend more time studying

based on the assumption all girls liked him, niles felt sure heidi would say yes when he asked her out.

aidan was afraid the assumption of the exam would be too difficult and that he would fail the class.

a friendly assumption makes it easier to get to know other people in new situations.