The Rehabilitation Therapist Wants to Determine If the Sensory Integration

The rehabilitation therapist wants to determine if the sensory integration sessions are helping to reduce Ed's hand-slapping. What is the BEST method for recording momentary time-sampling data?

A) Fifteen-minute observation periods are divided into 3-minute intervals. Staff then record whether or not hand-slapping is occurring at the end of each 3-minute interval.
B) Twenty-minute observation periods are divided into 10-minute intervals. Staff then record whether or not hand-slapping is occurring during each 10-minute interval.
C) Thirty-minute observation periods are divided into 2-minute intervals. Staff then record whether or not hand-slapping occurs at any moment during each 2-minute interval.
D) One-hour observation periods are divided into 10-minute intervals. Staff then record whether or not hand-slapping occurs at all during each 10-minute interval.