Which words in the sentence make up the infinitive?

when you go to the grocery store, fruits and vegetables are healthy foods to buy.

a.
are healthy foods

b.
to buy

c.
to the grocery store

d.
you go

Why is it important to be aware of you audience's interests? a. so that you can teach them new information thy didn't know b. so that you can use opposite ideas in order to shock them c. so that you can use the most effective strategy to persuade them d. so that you can pretend to like the same things and get them to trust you