Answer the following questions by choosing the most appropriate option.

Transform the given compound sentence into complex sentence.
You have to be 18 years old or you cant drive.

A. You cant drive because you are under 18.

B. To drive, you have to be 18 years old.

C. If you are under 18, you cant drive.

D. If you are 18 year old, you cant drive.

Please do not use chat terms. Example: avoid using "grt" instead of "great".