The Research on Practice and Memory Improvement Demonstrates That

The research on practice and memory improvement demonstrates that

A) for most people, one exposure to the material is sufficient unless that material is extremely difficult.
B) several reviews of the same material-without taking breaks in between-is especially effective.
C) in general, we have little evidence for the total time hypothesis.
D) learning is more effective if learning trials are spread out over time, rather than if you study without a break.