20.

Answer and Explanation

Your Answer is

Correct Answer is F

Explanation

According to the meaning of the sentence, made festive with flowers and pink balloons modifies the boat, item F is correct.

G item: for as a conjunction means "because", there is no causal relationship before and after.

Item H: which guides the attributive clause as the subject or object in the clause.

Item J: making it...is not a complete sentence, and a period cannot be used before it.