<p>Let's analyze the sentence:<br></p><p><strong>Only twenty percent of entry-level employees are not satisfied with the wage (___ at Partick Manufacturing).</strong></p><p dir="ltr">The part wrapped with "()" is an adjective clause.</p><p dir="ltr">What's missing in the adjective clause is the relative pronoun "which" or "that" and the verb "are offered'. The sentence should be:</p><p dir="ltr"><strong>Only twenty percent of entry-level employees are not satisfied with the wage (which are offered at Partick Manufacturing).</strong></p><p dir="ltr">In this adjective clause, the relative pronoun “which” is used as a subject of this clause. It can be omitted, but the verb after it must turn into a past participle, “offered.” So, the sentence becomes:</p><p dir="ltr"><strong>Only twenty percent of entry-level employees are not satisfied with the wage (offered at Partick Manufacturing).</strong><br></p><p dir="ltr">Thus, the correct answer is (C) offered. </p>