For Early Adherents, One of the Most Appealing Aspects of Buddhism

For early adherents, one of the most appealing aspects of Buddhism was

A) its lack of defined rules.
B) its worship of one god, the Buddha.
C) the ability to exist completely outside the caste system.
D) the equality among classes and genders.
E) the set of rules that, if followed strictly, would bring earthly as well as eternal happiness.