Answer:
The best option is:
b. For conditions of P, V, and T to be the same, the gases can be different but the number of moles of gas in each balloon must be the same.
Explanation:
This is in accordance with Avogadro's law which states that equal volume of all gase under the same temperature and pressure contains the same number of mole.
From this law, V varies as T and P as in the option. So For conditions of P, V, and T to be the same, the gases can be different but the number of moles of gas in each container must be the same.