Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Generally, 3 d transition metals…

Given below are two statements: One is labelled as Assertion $\displaystyle \mathbf{A}$ and the other is labelled as Reason R. Assertion A : Generally, $\displaystyle 3 d$ transition metals have high melting points. Reason R : Involvement of $\displaystyle 3 d$-electrons in addition to 4s-electrons in the interatomic metallic bonding. In light of the above statements, choose the most appropriate answer from the options given below: