Exodus means "A departure of people." So, the answer is A.
A synonym for frustration could be angry. For discussion, it could be debate. And as for exclamation, it could be yell.
He wants to convince readers that Buddhism is worth studying
They are antonyms. Pollute and purify are opposite meanings. Pollute means to ruin or make something unclean, while purify means removing the harmful or dirtiness out of something.
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