Which is a complex sentence? They will not defeat their enemy until they come up with a better strategy. The castle is a fortress, but it does have some weaknesses. With its calm surface, the moat looked harmless, but it had hidden dangers. Watchful archers hid in the towers, and the soldiers stood ready below.

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

Explanation:

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The answer is A.

Explanation:

"They will not defeat their enemy" is an independent clause, and "until they come up with a better strategy" is a dependent clause. An independent clause + a dependent clause = a complex sentence.

Hoped this helped. Also, I just took the test and A was correct.

my sister gave her a record.

my sister gave a record to her.

explanation: