All but one substance would be involved with a neutralization reaction.

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   

C. definite shape, definite volume. that is a solid.

Ithink that the answer is b

Where is the illustration?