Which of the following factors affects the pressure of an enclosed gas

The answer is:

All the above

The explanation:

The volume and the temperature and the number of particles will affect the pressure of an enclosed gas.

because according to boyle's law when the temperature constant so the pressure and volume of a gas have an inverse relationship, when temperature is constant.

when:

PV = nRT

when p is the pressure

V is the volume

n is number of moles

T is temperature

from this law we can know that there is a relation between P and V and when n has a relation with the number of particles so:

volume, temperature and number of particles affect the pressure of an enclosed gas.