​Carl is five feet, ten inches tall, has a medium frame, and weighs 154 pounds. In other words, Carl is about in the middle of the ideal weight range according to the Metropolitan Life Insurance Company's desirable weight charts. This means that Carl

A) ​has a healthy waist-to-hip ratio.
B) ​needs to gain a few pounds.
C) ​should try to lose a few pounds.
D) ​none of these.

The information provided about Carl's height, weight, and frame size indicates that he is within the desirable weight range according to the Metropolitan Life Insurance Company's charts. However, there is no information provided about his waist-to-hip ratio or any other health factors that would indicate whether he should try to gain or lose weight. Therefore, the correct answer is D: none of these.