Regarding Control Charts, Changing from Three-Sigma Limits to Two-Sigma Limits

Multiple Choice

Regarding control charts, changing from three-sigma limits to two-sigma limits:

A) increases the probability of concluding nothing has changed, when in fact it has.
B) increases the probability of searching for an assignable cause when none exists.
C) decreases the probability that the process average will change.
D) decreases the probability that defects will be generated by the process.