Which of the following statement is incorrect?

A. When we combine two simple sentences by using an adverb or an adverbial phrase, we change the adverb of the sentence into adjective.

B. Two simple sentences are joined using a participle when they have a common subject.

C. The conjunction for noun clause in synthesis of complex sentences is that.

D. Compound sentences are joined using coordinating conjunctions.

Please do not use chat terms. Example: avoid using "grt" instead of "great".