Answer: the answer is a
Explanation: just in case you want more detail the answer is A. a signal phrase may appear before, in the middle, or after researched information you are sharing.
how do we know that this is the answer?
well, first off, the others don't make sense and second off, you got to know what's the meaning of it.
meaning of a signal phrase (define signal phrase)
signal phrases are phrases, clauses, or sentences that introduce quotations or paraphrases involving statistics or other important summaries
so that means the answer is a
hope this helps!!