The correct answer is B) an overflow of the atmospheric drain tank. Serious tube leaks in the air ejector after condenser assembly can allow air and water to enter the atmospheric drain tank, causing it to overflow. This is because the air ejector is responsible for removing air and other non-condensable gases from the condenser, and a leak in this system can disrupt this process, leading to the excess water and air entering the atmospheric drain tank. The other options are incorrect because: A) an overflow of the contaminated drain inspection tank is not directly related to air ejector leaks, C) clogged steam strainers are not a direct consequence of air ejector leaks, and D) fouled nozzles are not a common issue caused by air ejector leaks.