The apartment’s explosion, reportedly caused by a gas leak, produced a violent release of gas and heat. the heat increased the of the air in the room, which means an increase in the air's molecular kinetic energy.

Answer : Temperature is the correct option.

Explanation :

In the given statement,

The apartment’s explosion, reportedly caused by a gas leak, produced a violent release of gas and heat. The heat increased the temperature of the air in the room, which means an increase in the air's molecular kinetic energy.

We know that the kinetic energy of any particle depends directly on its temperature. When the temperature is increased, the molecules starts vibrating in order to increase its kinetic energy.

Hence, the correct option is (B) " temperature ".