I think the answer is one but I am not sure
Answer:
An independent clause (or main clause) is a clause that can stand by itself as a simple sentence. An independent clause contains a subject and a predicate and makes sense by itself.
Explanation:
hello,iam user in indonesia .in indonesia iam haikalhama/expert
16. Is C. A mother
17. is not B. but A. Italics
18. Is A. Boys
I have no clue about 19., sorry.