By Comparing Reaction Times Across Different Tasks, Donders Was Able

By comparing reaction times across different tasks, Donders was able to conclude how long the mind needs to perform a certain cognitive task. Donders interpreted the difference in reaction time between the simple and choice conditions of his experiment as indicating how long it took to

A) perceive the stimulus.
B) process the stimulus.
C) attend to the stimulus.
D) make a decision about the stimulus.