How Was the Social Hierarchy of India Transformed During the Reign

How was the social hierarchy of India transformed during the reign of the Guptas?

A) In general restrictions against low-caste groups and women became harsher and more pervasive.
B) While restrictions against untouchables became more strict, women achieved greater equality during the Gupta period.
C) Brahmins and other upper-caste groups lost their clear social distinctiveness as Indian society became more open to social mobility.
D) The castes were abandoned and replaced by the tripartite system of general varnas.