Emma believes that she will succeed in business if she works hard and carefully manages her time. Her belief most clearly illustrates

A) reciprocal determinism.
B) the Barnum effect.
C) positive emotion.
D) an internal locus of control.

Emma's belief that her success depends on her hard work and careful time management suggests an internal locus of control, meaning that she sees her own behavior and choices as the primary determinant of her outcomes. This is in contrast to an external locus of control, which would suggest that success is primarily determined by outside forces, such as luck or the actions of others.