A random variation from planned outcome that results from occasional and often unpredictable causes is called:

.................................. c. common cause variation.

>>>>>>>>>>>>>>  c. common cause variation.  >>>>>>>>>>>>>>>>

common cause variation...............................

c>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Agree with experts answer <<<<<<<<<<<<<<<

 common cause variation................

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c. common cause variation...............

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I go to option       C 

Thank you

My answer is same as experts of option (C)

The answer is : Option ( C )