Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): Historically, the understanding of inequality in the social sciences has been dominated by notions of class, race and more recently, gender.
Reason (R) : Social exclusion is not accidental but systematic, it is the result of structural features of society.
In the light of the above statements, choose the most appropriate answer from the options given below.