Answer:
B. this is the ship that
Explanation:
Dependent clauses are the part of the sentence that if you put them in their own sentence, they wouldn't work and it wouldn't make sense. They depend on independent clauses to work in a sentence.
To identify the dependent clause, you must look for the part of the sentence where if you left it alone in its own sentence, you wouldn't know exactly what's going on. In B it says "this is the ship that." This is an incomplete sentence. What did the ship do? What happened to the ship? We don't know, which is why it's a dependent clause.
