Question

I brought five_____? a, dozens orange or b, dozen oranges

Answer 1

the answer is dozen oranges 

Answer 2

I bought five dozen Oranges.

Answer: Option b

Explanation:

Since dozen is a collective noun, it is singular and plural at the same time. The plural tense ‘dozens’ can be used when it is followed by the preposition ‘of’ and plural noun.

“Orange” should be also used in plural due the collective noun "dozen".

For example: Dozens of oranges. Since it is not available in the option, option ‘b’ is valid.