For which of the following would it be appropriate to measure duration?

For which of the following would it be appropriate to measure duration?
A .  Amy responds very slowly to instructions during her discrete trials teaching sessions.
B .  Ethan leaves his work station and wanders around the building.
C .  Sarah takes so long to begin her math assignments in class that she is never able to finish on time.
D .  Ryan is trying to increase the speed of his typing at the computer keyboard.

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Answer: B