Which of the Following Statements About Causes of Variation Are

Multiple Choice

Which of the following statements about causes of variation are true?
I. Assignable variation is random in nature and cannot be eliminated or reduced.
II. Chance variation cannot be completely eliminated unless there are significant methods,techniques,or equipment used in the process.
III. Chance variation usually cannot be corrected,while assignable variation is correctable.

A) I only
B) II only
C) II and III
D) I and III