Which is a complex sentence?

A: they will not defeat their enemy until they come up with a better strategy.

B: The castle is a fortress, but it does have some weaknesses.

C: with its calm surface, the moat looked harmless, but it had hidden dangers.

D: watchful archers hid in the towers, and the soldiers stood ready below.

A: They will not defeat their enemy until they come up with a better strategy

Explanation:

First, a quick reminder.

Complex sentence is the one which consists of an independent clause and at least on dependent. The two clauses are connected by a subordinating conjunction.

Independent clause conveys full meaning and can stand on its own as a sentence.

Dependent clause only provides further information to the main clause and can't stand on its own.

So, knowing this, we see that answers B. C. and D. consist of two independent clauses linked with coordinating conjunctions (but, and).

Answer A. has independent clause (They will not defeat their enemy) and dependant (until they come up with a better strategy). The two clauses are linked with subordinating conjunction (until).

A!!! THEY WILL NOT DEFEAT THEIR ENEMY

Explanation:

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