In the Context of Psychology's Scientific Method,which of the Following

In the context of psychology's scientific method,which of the following scenarios best represents an operational definition?

A) Dr.Williams states that his subjects' manual dexterity can be assessed by the number of assigned manual tasks they are able to complete.
B) Dr.Bowden determines the efficiency of the newest jets found in the Air Force.
C) Dr.Smith states that his students must recall their earliest childhood memories and use these to understand more about themselves.
D) Dr.Benedict has his subjects go online to look up examples of "jealousy."