<ol>
<li>They had never before been in a museum with such an
extensive collection, they had a difficult time deciding
how to make the most of the limited time they could
spend there.</li>
</ol>
<p>(C) Never before had they been
(D) Never before having been
(E) Because of never before being</p>
<p>Okay. Know this sentence contains a comma splice eliminating A and B. Now what? :(</p>