Answer:
b. wings
Step-by-step explanation:
Birds do not have lags or fins, so you can cross out options a and c.
Birds have both wings and a body, but only one of them is used for flying.
What are wings?
Wings are the specialized limbs that allow birds to fly by creating lift and thrust.
A body is the main part of an animal that contains the organs and supports the limbs. A body is not used for flying, but for other functions such as digestion, respiration, and reproduction.
Therefore the correct answer is b. wings.