Contains a main clause, a subject and an action or linking verb, and makes sense on its own.
a. sentence
b. dependent clause
c. subordinating clause
d. coordinating conjunction

B and c per definition don't contain a main clause- so they're wrong answers. d - coordinating conjunction is  just one word, so it does not contain all the things listed above. The correct answer is a). sentence.

There’s no map so we can’t you