Privette found that _____ is a quality common to peak experience, peak performance, and flow.

A) competence
B) happiness
C) absorption
D) hard effort

Privette found that absorption is a common quality among peak experiences, peak performance, and flow. This refers to a state of complete engagement and focus on the activity at hand, with a sense of timelessness and a loss of self-consciousness. Competence and hard effort may contribute to these states but are not necessarily common across all three experiences. Happiness may be a byproduct of these experiences but is not a defining quality.