The answer is definitely D, because it contains two independent clauses that are joined together without a comma or conjunction. (An independent clause just means a chunk of language that has both a subject and a verb and could be a complete sentence on its own.)
Hi what about it need somthing
I can’t see the answers frl
Answer: You need to add the passage
Explanation: Because we dont know what the passsage is abt
Answer: B) No one knows what causes asthma, but family history is certainly influential.
Explanation: