Assume you have two hours to prepare for an exam. (The exam is in two days.) Of the following, which would produce the greatest retention? [Note: "Waiting" is not preparing for the exam.] Group of answer choices
A. Study for an hour, wait an hour, test yourself for an hour.
B. Study for an hour, wait an hour, study it again for an hour.
C. Study for an hour, study it again for another hour.
D. Study for an hour, test yourself for an hour.
