Neuter gender nouns refer to objects and things, since they don't have a masculine or feminine gender.
Options A and B: 'Clothes' and 'wardrobe' are both nouns that name objects. They do not have any gender and hence, both these options are correct.
Option C: 'Thief' belongs to the common gender. Common gender nouns are nouns that apply to both masculine and feminine genders. 'Thief' is one such noun as it can be used for a male as well as female thief. Hence it isn't a neuter gender noun and option C is wrong.
Option D is wrong because the answers lie in A as well as B.