Army helicopter pilots follow a preflight checklist because small things here and there can add up to disaster in the air later. This illustrates

a  organizational complexity.
b. how changing conditions are influenced by innovation.
c. why control is necessary to reduce the accumulation of errors.
d. how control helps organizations respond to changing standards.
e. how organizations cope with multiple control standards.

ANSWER:

why control is necessary to reduce the accumulation of errors