_____ of pigeons
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wing
-
chine
-
string
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flock
To solve this question, the user needs to be familiar with the common collective noun used to describe a group of pigeons.
Option A: "Wing" is not the correct collective noun for a group of pigeons. The word "wing" is used to describe the flight organ of a bird.
Option B: "Chine" is not the correct collective noun for a group of pigeons. "Chine" is a term used to describe a cut of meat from the backbone of an animal.
Option C: "String" is not the correct collective noun for a group of pigeons. "String" is used to describe a thin piece of cord or thread.
Option D: "Flock" is the correct collective noun for a group of pigeons. The word "flock" is commonly used to describe a group of birds, including pigeons.
Therefore, the answer is: D. flock.