Concept:The crop is a specialized part of a bird's digestive system used for temporary food storage.
Explanation:The crop is an enlarged part of the esophagus.
It enables a bird to eat quickly and store food before digestion continues.
Food passes from the crop to the proventriculus and then to the gizzard for grinding and digestion.
The gizzard mainly grinds food, not store it.
The proventriculus secretes digestive juices, and the duodenum is the first part of the small intestine.
Thus, the part that temporarily stores food in birds is the crop.
Answer:A. crop