According to Avogadro's law or principle, 1 L of H2(g) and 1 L of O2(g) at the same temperature and pressure

a
have unequal volumes
b
contain the same subscript
c
contain equal numbers of molecules
d
have the same mass

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.