To determine how long it takes to discriminate a stimulus using Donders' method you would:
A. Find reaction time (RT) for the discrimination RT task and subtract RT for the simple RT task
B. Find RT for the choice RT task and subtract RT for the simple RT task
C. Find RT for the choice RT task and subtract RT for the discrimination RT task
D. Find RT for the discrimination RT task and subtract RT for the choice RT task
Answer: A
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