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Given below are two statements :one is l...

Given below are two statements :one is labelled as Assertion A and the other is labelled as Reason R
Assertion A:In the complex `Ni(CO)_4` and `Fe(CO)_5`,the metals have zero oxidation state.
Reason R:Low oxidation states are found when a complex has ligands capable of `pi`-donor character in addition to the `sigma`-bonding.
In the light of the above statements,choose the most appropriate answer from the options given below.

A

Both A and R are correct but R is not the correct explanation of A

B

A is correct but R is not correct

C

Both A and R are correct and R is the correct explanation of A

D

A is not correct but R is correct

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