Correct Answer: A

Rationale: The correct answer is A: 'Confinement away from the general population.' Quarantine refers to keeping someone isolated from the general population to prevent the spread of disease. Choice B, 'A specialist's care,' is incorrect as it refers to medical treatment by a specialist, not isolation. Choice C, 'Experimental drug therapy,' is incorrect as it involves the administration of new drugs for research purposes, not isolation. Choice D, 'Imprisonment in a rehabilitation unit,' is incorrect as it implies being detained in a rehabilitation facility, not isolation for health reasons.

Correct Answer: D

Rationale: The original sentence is incorrect due to awkward phrasing. Choice D, 'This door will remain unlocked when the business is open,' provides a clear and concise correction, specifying that the door should be unlocked only when the business is open. Choices A and B do not address the timing aspect of unlocking the door, making them incorrect. Choice C is incorrect as the original sentence needs a revision to clarify the intended meaning.

Correct Answer: C

Rationale: The correct answer is 'C: Hold fast.' 'Adhere' means to stick firmly to something, which aligns with 'hold fast.' Choices A, B, and D are incorrect. 'Remain intact' does not capture the idea of sticking to something, 'loosen' is the opposite of 'adhere,' and 'position next to' does not convey the sense of sticking or clinging.

Correct Answer: D

Rationale: The correct answer is D, 'Complaining.' 'Querulous' means complaining in a petulant or whining manner. This word describes someone who is constantly finding fault and is difficult to please. Choices A, B, and C are incorrect because 'querulous' specifically refers to complaining behavior, not stealing, questioning, or overeating.

Correct Answer: D

Rationale: The correct answer is D, 'Obstructed.' 'Occluded' means blocked or obstructed, indicating that the circulation to the foot was hindered. Choices A, B, and C are incorrect because 'occluded' does not mean normal, impaired, or inadequate but rather obstructed.