The correct answer among the choices provided is:
A. Even though he loved grapes, Ian vowed never to grow them.
<span>Dependent clause is a group of words that cannot stand alone thus needs an independent clause to express a complete thought. "Even though he loved grapes" is the dependent clause because it does not express an </span>understandable point.
If the sentence in question is a statement (ends with a period), I would probably "however" as your transition word.