At a depth of 100 m below sea level, the average molecular speed will decrease. Option B.
According to the kinetic molecular theory, the molecules that compose matter are in constant random motion. The temperature of the gas is a measure of the average kinetic energy of the molecules of the gas.
At a depth of 100 m below sea level, the ambient temperature decreases and the pressure of the gas decreases as well. As such, the molecules of the gas will also decrease in speed. As such, at a depth of 100 m below sea level, the average molecular speed will decrease. Option B.
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