The number chosen? (3)
I believe the answer is:
few
This might be a double definition.
'the number' is the first definition.
(thesaurus)
'chosen?' is the second definition.
The definition and answer can be both groups as well as being singular nouns.
Maybe there's an association between them I don't understand?
Can you help me to learn more?
(Other definitions for few that I've seen before include "Indefinite but small number" , "Hardly anyone" , "Considerable number, ironically" , "Not many, just a handful" , "Relatively small number" .)