<p>This question was #6 on section 10 and rated as Medium, but I found it to be a bit difficult.</p>
<p>6 Beginning photographers may choose from among several camera types, (there is one which is) best for their particular interests.</p>
<p>(A) (D) (E) are eliminated because of obvious grammatical and stylistic errors.</p>
<p>(B) of which there is one
(C) one of which is</p>
<p>I got this question write merely because I found one to sound better than the other, but I can't quite put my finger on why the other one would be considered wrong.</p>
<p>(B) does not yield the passive voice. (B) is incorrect not because it is less concise but because it is ungrammatical. </p>
<p>The phrase “of which” introduces a relative clause whose relative pronoun is “which” and preposition is “of.” We can rewrite such a clause in the following form:</p>
<p>I take care of many llamas, of which I am somewhat scared.</p>
<p>I take care of many llamas, which I am somewhat scared of.</p>
<p>Applied to this case:</p>
<p>Beginning photographers may choose from among several camera types, of which there is one best for their particular interests.</p>
<p>Beginning photographers may choose from among several camera types, which there is one best for their particular interests of.</p>
<p>Clearly, the preposition as used in this clause doesn’t make sense.</p>