Which of the Following Qualifies as an Operational Definition

Multiple Choice

Which of the following qualifies as an operational definition?

A) Depression is a condition of unhappiness with a feeling of helplessness and worthlessness.
B) Conscientiousness is the percentage of assignments one finishes before the time they are due.
C) Retrograde amnesia is the loss of memories for events that happened prior to some trauma.
D) Self-actualization is the achievement of one's full potential as a human being.