The "Sigma" in the Term "Six Sigma Quality" Refers to Greek

The "sigma" in the term "six sigma quality" refers to Greek letter used to designate the estimated standard deviation or variation in a process. The higher the sigma level, the ________ and the higher the quality.

A) higher the amount of variation
B) lower the quotient of indeterminacy
C) higher the index of deviation
D) lower the amount of variation
E) higher the quotient of indeterminacy