Do you think there is a temperature at which sound cannot be heard?

The definition would be defined in the clarification section downwards and according to the given question.

Explanation:

This would be considered a lapse of temperature. The rate of acceleration sometimes gradually decreases, because as the temperature is lowered through height. The latter suggests that perhaps the layer of water nearest to either the surface moves the quickest, as well as the layer of water and the furthest just above the surface, travels the fastest pace, with shock energy passing underground.The waves move and curve vertically as a consequence. This will create an area of the "shadow zone" where the sound couldn’t reach into. Although it could be possible to have seen the origin, a guy standing throughout the loss impairment may not remember the sound. The charged particles are refracted vertically and it's never going to reach the listener.

The answer is b.the gaseous state is electrically positive, while the plasma state is electrically negative.