Counting gas particles with Avogadro

The name of physicist Amedeo Avogadro (1776-1856) is forever associated with “Avogadro’s number”, which arose from his famous hypothesis that, given equal conditions of temperature and pressure, the number of atoms or molecules in equal volumes of different gases is:

A) The same
B) Proportional to the atomic weights of the gases
C) Inversely proportional to the atomic weights of the gases
D) Dependent on the square root of the relative energy flux

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