74.
Your Answer is
Correct Answer is F
Explanation
The subject of the main clause is experts and amateurs, the predicate verb have joined, and urban beekeepers among them are modifiers that need to be separated by double commas. The attributive clause changes the predicate of the main clause from have joined to experts and amateurs, the predicate verb have joined, and urban beekeepers among them are modifiers, which need to be separated by double commas. The attributive clause makes the predicate of the main clause from
have joined become the verb of the attributive clause, so the subject lacks a verb, and the G/H item is wrong.