For a fixed amount of an ideal gas, an increase in the average speed of the gas molecules could cause which of the following quantities to increase? a. temperature onlyb. volume onlyc. pressure onlyd. volume and pressure onlye. temperature, volume and pressure

Pressure and temperature.

Explanation:

With increase in the average speed of the gas molecules could cause an increase in Temperature and pressure both.

we know that

velocity of the gas v ∝√T in Kelvin clearly, increasing the speed will lead to an increase in temperature of the gas.

Also, with increase in pressure the collision of the gas molecules on the wall's of the container will also increase indicating at increase in pressure as well.

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

not too sure thinking all accelerations are pointed down