According to Muraven and Baumeister's (2000)theory,how Should Self-Control Be Conceptualized

According to Muraven and Baumeister's (2000) theory,how should self-control be conceptualized?

A) Self-control is a limited inner resource that can be temporarily depleted.
B) Self-control is like a muscle,exercising self-control in one situation makes it easier to exert control on a subsequent occasion.
C) Self-control is like a pool,people can draw from many different sources.
D) Self-control is an illusion used to maintain a positive self-image.