Some people who have narcolepsy experience a sudden loss of muscle tone, a condition called . This can be very dangerous, as a person can hurt themselves during such episodes.

              Cataplexy is condition in which sudden loss of muscle tone occur.

Explanation:

                    Cataplexy is sudden and uncontrollable muscles weakness or paralysis that comes on during the day and is often triggered by a strong emotion such as excitement or laughter. Cataplexy occur during working hours. A more severe episode may involve total body collapse. In cataplexy the voluntary muscle tone occur. This condition is mostly associated with narcolepsy which is a sleep disorder.. Symptoms of cataplexy have;

1) Dropping eyelid.

2) Jaw dropping.

3) Neck muscle weakness.

answer; i believe is(b)converging