A simple sentence connect by a subordinating conjunction to a compound sentence is know as

Question

a compound-complex sentence.

A relative clause
a.begins with a coordinating conjunction such as and but,or,nor,and so on.
b.begins with a relative pronoun such as that,which,who,or whom.
c.has a subject and a verb and is a complete that can stand alone.
d. both b and c
I am not sure if it a

Answer 1

Your first answer is correct.

Your second answer is incorrect.
http://www.chompchomp.com/terms/relativeclause.htm

Answer 2

D is incorrect because C is incorrect.

Only B is correct for the second question.

Relative clauses are DEPENDENT clauses and can never be independent sentences on their own.