Help with these Grammar questions

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1

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<li>The television station has received complaints about advertisements, which some viewers condemn (to be) tasteless.</li>
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<p>What would be the correct preposition to phrase it? And what's the reasoning behind why it's wrong?</p>

<ol>
<li>Explaining modern art is impossible, partly because of its complexity but largely because (of it rapidly changing).</li>
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<p>Answer - of the rapidity with which it changes</p>

<p>My answer - it makes rapid changes</p>

<p>Why is my answer wrong and the right answer right?</p>

2

<ol>
<li>I believe the idiom is condemn as. The correct answer should be condemn as tasteless. </li>
<li>I think it’s a parallelism issue. “because of its complexity” is parallel to “because of the rapidity with which it changes.”</li>
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