Can someone please answer this question

Question

An inflated basketball is left outside. Over the winter, which of the following must decrease?

1. Temperature inside the ball
2. Mass of the ball
3. Volume of the ball
4. Pressure exerted on the ball from the inside
5. Number of gas molecules inside the ball
6. Boltzmann's Constant
7. Number of moles inside the ball

Answer 1

Decrease: The temperature would go down in the cold room. If T decreases at constant Pressure, the volume will decrease (Charles Law)

Increase None

Stay Constant: Number of gas molecules and moles in the ball (not leaking or reacting), Boltzmann Constant (In the name). The mass of the ball and the air in it will not change (The weight would change if it was measured accurately enough to measure the buoyancy effect). The pressure on the ball from the outside air is atmospheric pressure.