a. dipole-dipole bonding
b. london dispersion forces
c. hydrogen-bonding
d. ion-dipole bonding

a. Dipole-dipole bonding

Explanation:

SO2 has dipole-dipole bonding. This is because of the difference in the electronegativities  of Sulphur and oxygen. Moreover, the lone pair of electrons on S gives it bent shape with a net dipole  unlike CO2 which has a linear shape.( This why CO2 does not have any dipole moment).

So, the correct answer is a.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

they are all solids.