I believe that the answer would be A, Simple. I researched the different definitions of all of the types, I will provide you with each of them. (Source; Google)
1) Simple- a sentence consisting of only one clause, with a single subject and predicate. 2) Conjoined - <span>has two (or more) clauses joined together using coordinating conjunctions (and, but, or …) E.g. Zubair fell and twisted his ankle. 3) Complex- </span>a sentence containing a subordinate clause or clauses. 4) Compound- a sentence with more than one subject or predicate.
