I need help with this pleas ASAP this is over due

The answer is B.

Electrons emit energy when they return from the excited state to the ground state.

Aconductor easily transfer heat

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf