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Methods of study which improves an individual's understanding and retention are said to be effective. Hence, from the options given, interleaving does not seem to be an effective.
Spacing encourages long hours of study in other to grasp the root of a concept rater than trying to memorize or cram the notes within a short period.
Practice testing is used to evaluate one's ability or grasp of the information by testing one's knowledge using tentative exercises.
Interleaving involves mixing or studying more than one subject or knowledge domain at a time. In most cases, these concept leads to confusion and might work for others.
Therefore, the most appropriate option is B.
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