D. thesis would be my answer
Answer:
D. He laboriously studied the birds migrating to the local sanctuary.
Explanation:
The most widely accepted guideline for using participial phrases is to properly punctuate them whenever they appear in a sentence. When the information in a participial phrase is not essential to the meaning of the sentence as a whole, it is put in the middle of the sentence and only separated by commas.
A verb or subject or maybe it’s not correct
