What does the ideal gas law describe?
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A. The relationship between the temperature, volume, and kinetic
energy of a gas
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B. The relationship between the pressure, volume, temperature, and
amount of a gas
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C. The relationship between the temperature, pressure, and molar
mass of a gas
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D. The relationship between the pressure, molar mass, and molality
of a gas

The Ideal Gas Law is the relationship between pressure volume temperature and amount of gas.

Explanation:

The Ideal Gas Law is the relationship between pressure volume temperature and amount of gas.

The Ideal Gas Law is derived from the combined gas law in the following way...

P₁V₁/n₁T₁ = P₂V₂/n₂T₂  =>  If one side of the equation is at STP then the data given for any reaction at STP will always give the value 0.08206 L·atm/mol·K. In application to chemical reactions this value is called the 'Universal Gas Constant' (R) and applies to all chemical reactions at STP conditions. That is,

P₁V₁/n₁T₁ = P₂V₂/n₂T₂  becomes  (PV/nT)at STP = (PV/nT)non-STP

  => R =  (PV/nT)non-STP