Concept:A collective noun is a word that names a group of people, animals, or things treated as a single unit. Examples include team, flock, and audience.
Explanation:'Brood' refers to a group of young birds born at the same time. 'Choir' refers to a group of singers. 'Caravan' refers to a group of travelers journeying together. All three are collective nouns.
'Courage', on the other hand, is an abstract noun. It describes a personal quality – the ability to face danger or difficulty. It does not represent any collection of individuals or objects. Hence, it is not a collective noun.
Therefore, among the given options, only 'courage' does not belong to the collective noun category.
Answer:D. Courage