Here is the revised paragraph with the correct pronoun agreement:
"everyone is excited for the pep rally. katie and jill are in charge of blowing up the balloons, their least favorite task. they hate how the balloons have to be completely full or they won't float. on the other side of the gym, sam is practicing her cheer routine. if she doesn't practice, she could embarrass herself. the last to arrive are brynn and avery with the shirts to give away. as long as everyone does their part, the pep rally will be a success.
♡︎ note: obviously you would use capital letters i just don't type like that
The first choice would be the correct answer it makes more sense and goes along with the story
