In a stringed musical instrument, the part that vibrates in resonance with the sound waves produced by the strings is called the
a. reed.
b. sounding board.
c. membrane.
d. diatonic scale.

In a stringed musical instrument, the part that vibrates in resonance with the sound waves produced by the strings is called the sounding board. The correct option among all the options given in the question is option "B". There are variety of stringed instruments that are available in the market and the technology with which it is made is almost the same.

Generally spontaneous human combustion is something that still bewilders some, human combustion happens very rarely and doesn't affect the surrounding areas, so unless you want to set your self on fire, human combustion will remain spontaneous and very rare.