Aaa ayuda xfavor, doy corona a la respuesta correcta.

Idk the answer sorry

Is a logical series of steps

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   

Ibelieve the answer is d. titaniumhope my answer has you : )