<p>Public speaking experts agree that it is better to express simple ideas <strong>comprehensibly</strong> than to use complex structures with no persuasive point.</p>
<p>The correct answer is <strong>C) comprehensibly</strong>.</p>
<p>In this sentence, we are comparing two ways of expressing ideas: expressing them <em>comprehensibly</em> (in a way that is easy to understand) and using complex structures with no persuasive point. The word "comprehensibly" is an adverb that describes how the simple ideas should be expressed.</p>
<p>The other options are not correct because:</p>
<p>(A) "comprehend" is a verb, which means to understand, but it does not fit the sentence structure.</p>
<p>(B) "comprehensible" is an adjective that means capable of being understood, but it does not fit the sentence structure.</p>
<p>(D) "comprehensibility" is a noun that means the quality of being understandable, but it does not fit the sentence structure.</p>