求问一道gmatclub题

Emmayeli

An avid television viewer isstatistically more likely to take sleeping pills at bedtime than a person whoenjoys listening to classical music but does not watch television as a habit.Clearly, listening to classical music just before bedtime contributes to a morerestful night’s sleep, whereas watching television before bedtime has theopposite effect.

Which of the following, if true, most seriously weakens the aboveargument?

A. People who enjoy classical music typically like to read just beforebedtime.

B. Sleeplessness is more common among people who watch late-night televisionthan among people who do not.

C.Engaging in a bedtime activity that is mentally stimulating ofteninterferes with a person’s ability to fall asleep.

D. A silent environment is less conducive to restful sleep than anenvironment with calming ambient sounds.

答案是A，但我觉得是B。虽然觉得A也有道理，说明是因为其他原因导致他们可以睡觉，但是觉得B也有道理，说明因果倒置或者说具有相关性。请问有人能解答我的疑惑嘛？