lonization of transition metals involves the loss of ns electron before (n) 1) d electrons.
Reason: Filling of ns-orbitals takes place before (n) 1) d orbitals.

a) Both Assertion and Reason are true, and Reason is the correct explanation of the Assertion.
b) Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion.
c) Assertion is true, but Reason is false.
d) Assertion is false, but Reason is true.