It would be A, because Everybody's Welcome is a title, and it acts like a name so it needs capital letters.
It wouldn't be B, because hometown isn't a name but a object/subject.
C, for the same reason as A : Everybody's Welcome is more of a name.
Yes it can be spread. Through the air and from one person to another
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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Cars were designed for transportation. After time, they became one of the main causes of pollution.
Have a nice day :D