The sentence in which is the semicolon used correctly is Of all twin types, identical girl twin pairs are closest to each other; while fraternal boy pairs tend to experience less closeness than any other twin pair. Thus the correct option is C.
The semicolon is referred to as a mark of punctuation used in any sentence in place of a comma when dividing two independent clauses in a sentence. These independent clauses have subject-verb and predicate making it a complete sentence.
In statement 3 both, the statement shows complete meaning as one thought by separating independent clauses and having individual subjects uses semicolon correctly.
Therefore, option C is appropriate.
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