Convert the sentence provided below from its passive voice structure to an active voice structure: Ancient artifacts are believed to have been quietly removed from the location by trespassers before the audit.

The correct option is (c). The given sentence is passive with a reporting structure: are believed to have been removed. The subject Ancient artifacts is not the doer; the doer is mentioned at the end with by trespassers. To convert to active, we should make the agent (doer) the subject: trespassers. However, we must also preserve the reporting phrase are believed, because it shows that the statement is an assumption/belief, not a confirmed fact. Option (c) correctly keeps this meaning and changes the voice properly. Correct active form: Trespassers are believed to have quietly removed ancient artifacts before the audit. Rule (Passive to Active for reporting verbs): Passive: Subject + be + believed/said + to + have been + V3 + by + agent Active: Agent + be + believed/said + to + have + V3 + object Why other options are incorrect: Option A removes the important idea of belief and changes the meaning from ‘it is believed’ to a definite fact. Option B changes the meaning completely by focusing on location, not artifacts. Option D remains passive and does not convert to active voice. So the correct answer is (c)