When Celeste Was Playing Her Stereo at 40 Decibels and She

When Celeste was playing her stereo at 40 decibels and she turned it up to 44 decibels, she could notice that it was louder. If Celeste's stereo were playing at 80 decibels, what should her just noticeable difference be?

A) 2 decibels, half as much as it was at 40 decibels
B) 4 decibels, the same as it was at 40 decibels
C) 6 decibels, 50 percent more than it was at 40 decibels
D) 8 decibels, twice as much as it was at 40 decibels