NEET 2022 Biology question

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : All vertebrates are chordates but all chordates are not vertebrates. Reason (R) : Notochord is replaced by vertebral column in the adult vertebrates. In the light of the above statements, choose the most appropriate answer from the option given below :

• (A)(A) is not correct but (R) is correct
• (B)Both (A) and (R) are correct and (R) is the correct explanation of (A)Correct
• (C)Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• (D)(A) is correct but (R) is not correct