In a condenser of a power plant, the steam condenses at a temperature of 333 K. The cooling water enters at 303 K and leaves at 318 K. The logarithmic mean temperature
difference (LMTD)of the condenser is

A

$$16.2^\circ C$$

B

$$21.6^\circ C$$

C

$$30^\circ C$$

D

$$37.5^\circ C$$