Consider the Following Statements

Multiple Choice

Consider the following statements:
I. Behavioral scientists find that perfection standards often discourage employees and result in low worker morale.
II. Practical standards are also known as attainable standards.
III. Practical standards incorporate a certain amount of inefficiency such as that caused by an occasional machine breakdown.
Which of the above statements is (are) true?

A) I only.
B) II only.
C) III only.
D) II and III.
E) I, II, and III.