<p>The rental deposit must be transferred to the landlord's bank account at least 10 days <u>prior to</u> the moving-in date.</p><div data-answer="d"><span style="font-size: 13.008px;">The correct answer is (D) prior to.</span></div><div data-answer="d"><span style="font-size: 13.008px;"><br></span></div><div data-answer="d"><span style="font-size: 13.008px;">The phrase "prior to" means "before" or "in advance of." In this sentence, it indicates that the rental deposit must be transferred to the landlord's bank account before the moving-in date. The phrase "at least 10 days" indicates that the transfer should happen no later than 10 days before the moving-in date.</span><br></div>