writing mc questions--please explain

Test Preparation SAT Preparation
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<ol>
<li>Each of Beethoven’s (many acts of) ungraciousness (seems) (to have been balanced) by (an act) of kindness.
No error</li>
</ol>

<p>i thought "an act" was wrong bc it wasn't parallel. shouldnt it be replaced with "acts"?</p>

<ol>
<li>Whether the Egyptians actually sailed or did not to South America remains uncertain.
a. The actuality of whether the ancient Egyptians sailed
b. That the ancient Egyptians actually did sail </li>
</ol>

<p>the answer is b, but why is a wrong? and please elaborate! thanks :)</p>

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<p>“each” is singular, so the singular “act” is parallel.</p>

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<p>“The actuality of whether” is an illogical phrase. The “whether” encompasses both possibilities: they sailed or they did not sail. And so there would no uncertainty that one of these occured.</p>