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.
The first purpose that Richard's soliloquy appears to serve is to reveal the motivations and personality of the character - we can see that he hates himself because he was basically a hunchback, so he was pretty self-conscious about it. He also reveals in the first scene what he intends to do throughout the play.
As for the second purpose, I'd choose the answer - it informs the audience about the background of the plot, as it gives us reasons why Richard decided to do what he did.
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The answer is bandwagon. This is because they use the word "everyone" to convince you to agree with the others.