Which one of the following sentences contains a collective noun?
a. the quality of mercy is not strained.
b. listen, my children, and you shall hear.
c. the legislature met in secret session.
d. who among you is a butcher, a baker, or a candlestick maker?

The following sentence containing a collective noun is letter B: Listen, my children, and you shall hear. Common nouns are nouns that are in a group. Nouns are names of a person, animal, place, event, etc. It could be proper or common noun. Common nouns are names of general items and you find them everywhere you go. These words are not usually capitalized, except if it is the starting word in a sentence. Proper nouns on the other hand are more specific names and they are capitalized. 

The correct answer would be what do they already know about my topic