The social class a person is born into is a primary dimension of diversity, while his or her is a secondary dimension.
(a) ethnicity.
(b) education.
(c) gender.
(d) race.

(B) Education.

Explanation:

Diversity can be explained as "otherness" and human being qualities that are different from our own and outside the group from which we belongs. A person has its quality and the group has its own.  

There are two types of diversity among human being :

Primary dimension:

Age, Ethnicity, Gender, Race, Sexual orientation. these are innate

Secondary dimension:  

The secondary dimension of diversity is those which can be changed by a person such as Education, career, marital status, geographical address etc.

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