Concept:Gas pressure arises from gas molecules colliding with the walls of the container, and the speed of the molecules determines how strong and frequent those wall collisions are.
Explanation:A faster gas molecule strikes the wall with greater momentum, producing a larger force on each impact.
When the speed of the gaseous molecules increases, both the rate of collision with the walls and the force per collision increase, so the pressure rises.
This is also seen in the kinetic theory relation
P=31VNmv2, where molecular speed is a key factor.
Pressure is not determined solely by the total gas volume or by the mass of one molecule acting independently.
Moreover, the pressure exerted on the container is due to molecule–wall collisions, not collisions between the gas molecules themselves.
Answer:B. speed of the gaseous molecules