Because genetics is now progressing so rapidly, it is revolutionizing medical research. Identify the subordinate clause in the sentence. A) is now progressing B) is now progressing so rapidly C) it is revolutionizing medical research D)

Because genetics is now progressing so rapidly.

The subordinate clause starts with a subordinating conjunction and contains the entire dependent clause. Because is a subordinate conjunction and makes the clause dependent because you need to know what's next. Hopefully answer choice D has all the right pieces. The main clause is "it is revolutionizing medical research". This clause is a complete idea by itself and is not a subordinate clause.