Respuesta :
Answer:
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.
Answer:
It'd be (A)
They will not defeat their enemy until they come up with a better strategy.