A
Birds
B
Primates
C
Reptiles
D
Amphibians
Correct answer: (a) Birds
Explanation
- A
Birds
Birds. Frogmouth, barbet, minivet, redstart — all avian.
- B
Primates
Primates. Unrelated.
- C
Reptiles
Reptiles. Unrelated.
- D
Amphibians
Amphibians. Frogmouth is a bird, not a frog.
Summary. Official key is (a) birds. Ceylon frogmouth, coppersmith barbet, grey-chinned minivet and white-throated redstart are all birds. The frogmouth name is the trap.