B is wrong. A and C are right. A would be my first choice, but I might employ C if the 'example' and the 'clarification' were two completely different things and had nothing to do with each other.
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AnonymousWould you say that as long as a word is singular, we cannot use 'those' right before it even if the word 'those' follows more than one objects?That + singular, those + plural is a good rule.
AnonymousThanks for those example and clarification.No.
AnonymousDoes it sound natural?those rich is not natural. No.