JEE Main 2023 Chemistry question

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason(R). Assertion (A) : The first ionization enthalpy of 3d series elements is more than that of group 2 metals. Reason (R) : In 3d series of elements successive filling of d-orbitals takes place. In the light of the above statements, choose the correct answer from the options given below.

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