Answer:
B. them.
Explanation:
In any sentence, a vague or unacceptable word is any word that is used or put in a sentence but does no have any special or purpose in the sentence. It is not necessarily required in the sentence.
In the given sentence, the use of the word "them" to refer to the "roses" has no special purpose in the sentence. Rather, the sentence can well manage itself even without the word "them" in it. So, the vague or unacceptable word is "them".
