S Block Elements

Given below are two statements : one is labelled as
Assertion \(\mathbf{A}\) and the other is labelled as Reason \(\mathbf{R}\) :

Assertion A : Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.

Reason R : The deep blue solution is due to the formation of amide.

In the light of the above statements, choose the correct answer from the options given below :