What Was the Attitude of Buddhism Toward the Caste System

What was the attitude of Buddhism toward the caste system?

A) While the Buddhists did not regard social stratification as critical to the faithful, they only accepted members of the upper-caste groups as monks.
B) Buddhists rejected the caste system and admitted untouchables and women as members of the faith.
C) The Buddhists accepted the caste system entirely and incorporated it into their religion.
D) The Buddhists recognized only wealth as a means of defining one?s social position.