27.
Your Answer is
Correct Answer is D
Explanation
The subject of the sentence is kids, the predicate is is gathered, and item D satisfies the subject-predicate structure, which is correct.
Item A/B: It is an attributive clause. At this time, the main clause has no predicate, and is gathered is the predicate of the clause.
Item C: There is no parallel content before and after ", and", error.