I’m sorry you had to go through that. It gets better with time though
The correct answer is A.
An Adverb Clause, also known as Adverbial Clause has the function of an adverb, and, in this case, it answers the question how, and talks about a possible situation and consequences: If you don't buy the tickets in advance, <em>you may not be able to get them</em>. The second sentence is a possible situation in the case of a delay to buy the tickets.
“There’s no apostle I would counterfeit;I mean to have money, wool and cheese and wheat...” The Pardoner explaining in these lines from “The Pardoner’s Tale” is that he will do his best in obtaining what he wants without hurting or stealing from others.
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