Cheap. Inexpensive means cheap and the movie theater cost money, so he probably wouldn't want to go there
I think that the answer to the question is C
A complex sentence contains one independent clause and at least one dependent clause. Here, in your example, there are two simple independent clauses which you need to merge using a dependent adjectival clause in order to make one complex sentence. Here is how to do it:
The boy <u>who wore a green coat</u><u /> carried his sister home.
