|Flying birds||Flightless birds|
|Winged birds||Wingless birds|
|Flightless birds||Flying birds|
|Wingless birds||Winged birds|
Correct Answer: A
Solution :Vulture and owl (shown in group X) are birds that have wings and can fly. Ostrich and penguin (shown in group Y) are birds with wings but they are flightless birds, i.e., they cannot fly.
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