D. Only B and C
Medium and High levels can be harmful. But low even levels aren't good either.
Answer:
The pressure increases by a factor 8
Explanation:
For a gas held at constant temperature, Boyle's law can be applied. It states that the product of the gas pressure and the gas volume is constant, so we can write:

where
is the initial pressure
is the final pressure
is the initial volume
is the final volume
For the gas in this problem, the volume is reduced from

to

so we can rewrite the equation as

this means that the pressure of the gas will increase by a factor 8.
The direction of an arrow shows the direction of the force, and the length of the arrow indicates the amount, or size, of the force.
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