What is one MAIN difference between Graf and Herman? A. Herman is sullen, while Graf is friendly and sweet. B. Graf is energetic, while Herman is slow and sluggish. C. Graf is playful, while Herman is stern and hardworking. D. Herman is careful, while Graf is reckless and irresponsible.

the gas pressure p, gas volume v, and gas temperature t are given in the formula:   pv=nrt,

r is the gas constant, and n is the number of gas moles.

if the container is cooled and remains under atmospheric pressure, where r is a constant that does not change, the volume of the container remains the same, the conclusion is drawn that, with all other values ​​unchanged, the number of gas moles n, is decreases.

the right answer is a.