Respuesta :
The noun flock is D) a collective noun, because it refers to a group of entities.
C. Collective Noun
The word “flock” is what is known a collective noun, which is a noun that represents many things, or a group of things. For instance, “flock” is a word that collectively refers to a group of birds. A herd is a noun that refers to a group of cattle. A pod is a word that collectively refers to a group of dolphins. It is important to note, however, that even though a collective noun such as “flock” is comprised of many things/birds, it should still be understood to be singular because you would be talking about a singular group of things.