<p>Major social networking sites have developed features allowing registered users to post content on a <strong>personalized</strong> website.</p>
<p>The correct answer is <strong>(C) personalized</strong>.</p>
<p>In this sentence, we need an adjective to describe the type of website that registered users can post content on. The word "personalized" is the correct adjective because it means customized or tailored to an individual's preferences or needs. The word "personalize" is a verb, so it does not fit in this context. "Personally" is an adverb, which modifies a verb or adjective, so it is also not the correct choice. "Personalization" is a noun, which refers to the act of making something personalized, but it does not describe the website itself.</p>