I am afraid he is burning the candle at both ends. A. putting in sustained efforts B. working at night also C. working hard D. overtaxing his energies

The correct

The phrase “burning the candle at both ends” means to work too hard and not get enough rest. It is often used to describe someone who is trying to do too much and is not taking care of themselves.

Option A, “putting in sustained efforts,” is not the correct answer because it does not necessarily mean that someone is overtaxing their energies. Someone could be putting in sustained efforts and still be getting enough rest.

Option B, “working at night also,” is not the correct answer because it does not necessarily mean that someone is overtaxing their energies. Someone could be working at night and still be getting enough rest.

Option C, “working hard,” is not the correct answer because it does not necessarily mean that someone is overtaxing their energies. Someone could be working hard and still be getting enough rest.

Therefore, the correct answer is D. overtaxing his energies.