​The cladogram given below shows the distribution of derived characters (A to D) that define each of the groups shown at the tip.​

​Select the correct arrangement of characters that are being described by A to D.​

Correct option is B

Explanation-

Taxa in order (left to right):
Sharks → Ray-finned fish → Amphibians → Primates → Rodents/Rabbits → Crocodiles → Birds
Labeled transitions:
            A: before ray-finned fish
            B: before amphibians
            C: before primates/crocodiles/birds
            D: before primates and rodents/rabbits only

A: Vertebrate
Sharks are vertebrates, and A is placed before sharks.
 So, A = Vertebrate 
B: Bony skeleton
Sharks (cartilage), ray-finned fish and all others (bones).
Transition to bony skeleton happens between sharks and ray-finned fish.
So, B = Bony skeleton 
C: Amniotic egg
Appears after amphibians, and before reptiles, birds, mammals.
So, C = Amniotic egg 
D: Hair
Only mammals (primates + rodents/rabbits) have hair.
D is between amphibians and mammals, before primates and rodents/rabbits.
So, D = Hair 

Label Trait Justification
A Vertebrate Sharks and onwards are vertebrates
B Bony skeleton Bony skeleton appears after sharks
C Amniotic egg Appears in reptiles, birds, and mammals
D Hair Unique to mammals (primates, rodents/rabbits)

Final Answer: Option (B)

A=Vertebrate, B=Bony Skeleton, C=Amniotic egg, D=Hair