D. You're being asked a question, so it's interrogative. You can remember that by thinking that interrogative is like being interrogated, aka being asked questions.
Sing = singing (present-tense) + sang (past-tense)
Yell = yelling (present-tense) + yelled (past-tense)
Lace = lacing (present-tense) + laced (past-tense)
Talk = talking (present-tense) + talked (past-tense)
Slice = slicing (present-tense) + sliced (past-tense)
Dance = Dancing (present-tense) + Danced (past-tense)
Sentence B indicates this transition as inclusion of “supported by many experts in the field” which will transition into evidence to confirm their reason.
A. Sentences connected closely in meaning