Scarborough (1972) Could Not Draw Any Conclusions About Differential Forgetting

Multiple Choice

Scarborough (1972) could not draw any conclusions about differential forgetting in his auditory and visual presentation conditions because

A) performance in the auditory and visual presentation conditions was equivalent across all retention intervals.
B) performance was virtually perfect in all conditions at the zero retention interval.
C) performance was poorer in the auditory than in the visual presentation condition at the longer retention intervals.
D) performance was poorer in the visual than in the auditory presentation condition at the longer retention intervals.