Give below are two statement: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: According to Marx, for revolution to occur, the proletariat must transform from a 'class in itself to a 'class for itself.
Reason R: One of the reasons of this transformation is the increasing economic and social distance between the bourgeoisie and the working class.
In the light of the above statements, choose the most appropriate answer from the options given below