48.
Your Answer is
Correct Answer is F
Explanation
There are two sentences before and after item F, and the latter sentence is an explanation of the previous sentence, which is correct.
The colon in item G is not needed, and the following is the adverbial clause of reason, which should be directly connected with the main clause.
The H item is not a complete sentence after the semicolon.
Item J is not a complete sentence after the semicolon.