The answer is either b or c
Wool is warm, but synthetic fibers are more water resistant.
This sentence is correct.
A subordinate clause, dependent clause or embedded clause is a clause that is embedded within a complex sentence. For instance, in the English sentence "I know that Bette is a dolphin", the clause "that Bette is a dolphin" occurs as the complement of the verb "know" rather than as a freestanding sentence.
