What Was the "Critical Incidents" Technique

What was the "critical incidents" technique?

A) a survey procedure used to elicit examples of unethical conduct by psychologists
B) a 10-point scale measuring the severity of an ethical infraction
C) a procedure for identifying studies that were ethically questionable but "critical" for advancing psychological science
D) a procedure whereby psychologists were sent a set of 50 experiments and asked to criticize them on ethical grounds