Question

review the fourth paragraph.
that has a positive effect on a persons physical and mental health.
4 however, the science that explains why some people love roller coasters may also explain why other people dont enjoy the experience at all. some scientists believe that certain peoples brains might contain more of a chemical that drives them to seek out thrills like roller coasters, bungee jumping, or rock climbing. people who have less of this chemical also have less of a desire to find the fastest roller coaster or the biggest, most stomach - churning drop. plus, studies suggest that thrill - seeking behavior declines after early adulthood. therefore, older adults may be less likely to look for things like roller coasters to give them a dose of excitement.
what does the fourth paragraph do?
it explains why some people might not enjoy roller coasters.
it summarizes the author’s main claim.
it gives background information on the history of roller coasters.
it explains why roller coasters are better than bungee jumping.

Explanation:

The fourth paragraph first states the science behind differing roller coaster preferences, links this to brain chemical levels (more chemical = thrill-seeking, less = no desire for thrills), and adds that thrill-seeking declines with age, which all explains why some people do not enjoy roller coasters. The other options are incorrect: it does not summarize a main claim, cover roller coaster history, or compare roller coasters to bungee jumping.

Answer:

It explains why some people might not enjoy roller coasters.