Please Help me solve this LEAN SIX SIGMA What element isnt p

Please Help me solve this. LEAN SIX SIGMA.

What element isn\'t part of the phenomenon behind the hidden factory: Working more hours than scheduled (such as Over Time) Unexpected and additional ordering of parts and materials Management deciding to reduce production schedules (e.g. lowering the production of pop corn poppers from 500 units a day to 300 units a day) Making room in the manufacturing building to stockpile rejected pop Corn poppers

Solution

the phenomena which is not a part of hidden factory six sigma is option D the making room in the manufacturing building to stockpile rejected pop corn poppers as these are never particularly given as pop corn in the phenomenon.