Which law, that was proposed in 1811, predicted that the same volume of gases at the same temperature and pressure would have the same number of molecules?

Correct option is C

The law that was proposed in 1811, predicting that the same volume of gases at the same temperature and pressure would have the same number of molecules, is known as Avogadro’s law.
 Avogadro’s law states that equal volumes of all gases, at the same temperature and pressure, contain the same number of molecules. This law was proposed by Amedeo Avogadro, an Italian scientist, in 1811, and it helped to clarify the relationship between volume and the number of molecules in a gas.
 Avogadro’s law is a key principle in the study of gases, and it played an important role in the development of the kinetic theory of gases. The law also helped to explain the behavior of gases in chemical reactions, and it was essential in the development of the mole concept, which is a fundamental unit of measurement in chemistry.