Here it says which of the following would represent a neutral ligand or ligand. So here we have bromide, hydrogen sulfide, ammonium ion, hydroxide ion and cyanide ion. First of all remember we said that the ligand types that we will focus on in Gen. chem are either neutral or negatively charged. Ammonium ion is positive so it's going to be out.
Next we have bromide. I'd means it has a negative charge -1, so that's out. Hydroxide eyed again, negative charge, that's out. Cyanide, CN CN-. That's out. The answer is B. Here, hydrogen sulfide represents H2S. H2S is similar to H2O. Remember H2O we saw as a common type of neutral ligand or ligand.
So hydrogen sulfide will fit the same bill, substituting out the oxygen for sulfur. It'll behave in the same way. So in this case, option D represents our neutral form of a ligand.