Answer:
The correct answer is letter D. We had to the movies
Step-by-step explanation:
Before I start to explain about my answer, I am going to explain what means "Independent clause" and how you can use it in a sentence. So, firstly, "Independent Clause" is a sentence that you needn't a complement to continue or to understand the whole sentence, like a preposition, a conjuction, and adverb, adjective, etc. In this case, this phrase explain by itself, without a complement.
We have in a "Independent clause" a subject and a predicate. The predicate of a sentence is the part that modifies the subject in some way, whatever sort of subject you have: person, place, or thing. That's because I answered this question with letter D "We head to the movies", because this sentence is complete and answer by itself without using another grammatical way to have the understanding of all contents.