<ol>
<li>It appears that either Jane or Marek will be elected (to be presidents) of the student union.
A) to be presidents
B) as presidents
C) presidents
D) for president
E) president</li>
</ol>
<p>A, B, C is wrong because "presidents" is plural while either...or... makes the subject "Jane" and "Marek" singular. </p>
<p>For president is redundant. The question already says they will be elected for the student union so “for president of the” is a bit redundant. I’m not sure what grammar rule can be applied to this question but most of these questions are sound tests. E sounds better than D.</p>