"David throws" is the one among the following choices given in the question that is the independent clause. The correct option among all the options that are given in the question is the second option or option "B". An independent clause always has a subject and a predicate. I hope the answer has helped you.
An independent clause has a subject, verb, and a complete thought. All of the other options have a subject and verb as well, but they do not have a complete thought. The words "If", "When", and "Since" require more information to complete the thought. The reader is left wondering If Gina catches... what?, When coach arrives...what? Since they scored...what?
