Jack is often sad because he just experienced the loss of his favorite pet. his friend jason frequently makes jack laugh, and offers to take him to movies, etc. this is an example of which friendship function?

I believe the answer is: Stimulation

In friendship function, stimulation refers to function that provide you with positive emotions in your life.

This could be achieved by things such as hanging out to have fun with your friends, cheering you up when you're down, celebrating when you achieve some things, etc.