A Researcher Compares Students' Performance Using a New Learning Strategy

Multiple Choice

A researcher compares students' performance using a new learning strategy to their performance using the old strategy.Students' performance is first tested with the old strategy,followed by the new strategy.The results indicate that students perform better with the new strategy.These results

A) are uninterpretable due to the confounding with practice effects.
B) the order of the two learning strategies does not matter.
C) indicate that teachers should use the new strategy.
D) all of these