Research by Baumeister and His Colleagues Presented People with Tasks

Research by Baumeister and his colleagues presented people with tasks that require self-control (like eating vegetables instead of available chocolates) have found that on subsequent self-control tasks people's effectiveness and self-control ability are diminished. Baumeister, et al. argue that these results suggests that

A) people generally have less self-control ability than they believe they do.
B) self control is more a function of temptation than of will-power.
C) commitment is critical to people's ability to resist temptations.
D) self-control is a limited resource like a muscle that tires with repeated use.