The most accurate way to describe the excerpt is to choose the option - it is a dependent clause. This means that something needs to be added - you need to finish the sentence so that it becomes an independent clause, and not a subordinate one.
What im gonna answer with this is there a question?
It is A because it restates the noun, CAT, with a different name, CALICO. It is also A because WHICH is a relative pronoun.
