Which answer choice combines the following sentences into one sentence that contains an independent and a subordinate clause, without changing the meaning?



I need to get an A on my history exam. My mother says I cannot go to the dance otherwise.

A. Unless I get an A on my history exam, my mother says I cannot go to the dance.
B. I get an A on my history exam and my mother says I cannot go to the dance.
C. I need to get an A on my history exam, or my mother says I cannot go to the dance otherwise.
D. My mother says I cannot go to the dance so I need to get an A on my history exam.