The atomic number of beryllium (be) is 4, and the atomic number of barium (ba) is 56. which comparison is best supported by this information?

a: they are in the same group because they have similar atomic masses, but they are in different periods because they have different chemical properties.
b: they are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.
c: they are in the same group because their atomic numbers are each multiples of four, but they are in different periods because they have different chemical properties.
d: they are in the same group because they have similar atomic masses, but they are in different periods because they have very different atomic numbers.