QOTD Help!

[orange_peel]

<p>Here's the problem:
According to their high school basketball coach,
A<br>
although Beth and her sisters worked equally hard in
B<br>
practice, Beth tended to outperform them both during
C D
games. No error
E</p>

<p>I thought the Answer would be A (their) because it makes a kind of dangling modifier (because their doesn't refer to anything, it's kinda referring to "although") and should be replaced by "the".
But the correct answer is NO ERROR! WHY?</p>

[book_worm]

<p>“their” is simply saying that the basketball coach ‘belongs’ to Beth and her sisters. It identifies which coach is theirs. </p>

<p>It’s like saying “her basketball coach,” only with two or more people as the subject, so ‘her’ is replaced with ‘their.’</p>