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[A] : Chordates have an oxygen carrying ...

[A] : Chordates have an oxygen carrying pigment called haemoglobin . It is always present in red blood corpuscles .
[R] : Non-chordates have either no haemoglobin or if it is present , it is present in plasma . Non-chordates require very little oxygen as compared to chordates for their body functions.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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