Which of the following explain the variations in solubility for methane, ethane, and ethylene?

Below are the choices and the answer is 1 and 4.

1. There are differences in molecular size and shape and thus in the strength of dispersion forces.

2. There are differences in the molecular dipoles of the molecules.

3. There is increased hydrogen bonding with an increasing number of hydrogen atoms.

4. There are differences in bonding between atoms within the molecules.