Part D What evidence can be used to support the fact that oxidation, reduction, or both took place in test tube 5?

The answer is probably c. xylem

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this

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