Two samples of gas, one of argon and one of helium, have the same pressure, temperature and volume. Which statement is true assuming both gases behave ideally?

The two samples have the same number of atoms but the argon atoms have a higher average speed.

The helium sample contains more atoms than the argon sample and the helium atoms have a higher average speed.

The two samples have the same number of atoms and both types of atoms have the same average speed.

The two samples have the same number of atoms but the helium atoms have a higher average speed.