Which of the Following Best Represents an Operational Definition

Multiple Choice

Which of the following best represents an operational definition?

A) Dr. Williams is counting the number of times a person picks up an item from the counter.
B) Dr. Bowden is determining the efficiency of the newest jets found in the Air Force.
C) Dr. Smith is having student's recall the earliest childhood memory they can remember.
D) Dr. Benedict is having his subjects go online to look up examples of jealousy.