24.
Your Answer is
Correct Answer is H
Explanation
Before and after the underlined part is a complete sentence, so separated by a semicolon, H is correct.
F/G item: That guides the attributive clause, which needs to be the subject or object in the clause, and there is no lack of subject and object in the F/G item clause.
Item J: There is no conjunction connection between the two complete sentences, which is wrong.