Question

setting up camp
1 vacation means something different to everyone. some people love to bask in the sun on the beach and listen to the lapping waves of the ocean. others pack up the car and take a trip across the country, stopping to see natural sights and roadside attractions along the way. and some people make camping a main part of their vacation. a camping vacation gives you the chance to enjoy nature and live a little differently from the way you normally do. in many ways, camping is the best type of vacation.
2 the clearest benefit to camping is the time you spend outside connecting with nature and with other people. camping offers a chance to separate
select the evidence that the author provides for the following supporting claim: it is relaxing to spend time outdoors in nature.
more people are going camping in the u.s.
people sleep longer when they are in a tent.
most campers say that camping reduces stress.

Explanation:

The claim is about relaxation from spending time outdoors in nature. "Most campers say that camping reduces stress" directly relates to relaxation (as reducing stress is a form of relaxation). "More people are going camping in the U.S." just shows popularity, not relaxation. "People sleep longer when they are in a tent" is about sleep duration, not the general relaxation from being in nature.

Answer:

Most campers say that camping reduces stress.