Molecules can be made of atoms Of

the same element only

different elements only

the same or different elements

The same or different elements

Explanation:

I did this question, thats correct.

Molecules can be made of the atoms of same element as well as of the different elements.

Explanation:

H2 is called a molecule because it is made up of atoms of same elements H.

Also, H2O is called a molecule as it is made up of atoms of different elements H and O.