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C.) p<span>olio is a contagious *disease* that has mostly been eradicated.</span>
Semicolon is used when separating 2 closely related independent clauses.
Colon is used when listing things, writing biblical references, between hours and minutes, proportion between 2 numbers, or between 2 clauses related to the first
So we'll write this one as-
Flour Power: A Guide to the Modern Green Kitchen
You're answer's the last choice