SAT Writing Question

<p>What is the answer to this writing question??</p>

<p>No one reason given for the fall of Rome, though many causes have been proposed over the centuries, (are adequate explanations for) why the mighty empire did not last.</p>

<p>(A) are adequate explanations for
(B) are an adequate explanation for
(C) adequately explain
(D) an adequate explanation of
(E) is an adequate explanation for</p>

<p>I chose (E) thinking that no one reason is singular...am I right??</p>

<p>E is correct.</p>