Answer:
I belive this is a simple sentence
The consumption of junk food can be explained in two ways: finances and comfort. With finances, junk food is generally cheaper than healthier foods, thus making unhealthy food more appealing, especially to families or individuals in tight financial situations. In regards to comfort, the consumption of tasty food releases chemicals in your brain like dopamine and seratonin (happy hormones) which then cause your brain to crave them more.
#1. Comma is used to off set the sentence
A would make more sense as the answer because a persuasive essay is opinionated so you should have opiniobs that go along with yours to be able to have more of a "backup" if you will. More people saying helps the reader feel more obligated to that opinion