When actors memorize, they add a few lines at a time to the previous lines that they already know. This resembles the rehearsal technique called

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Clustering is a rehearsal technique that involves grouping related information together to make it easier to remember. The process of adding a few lines at a time to the previous lines already memorized by actors is similar to this technique, making option B the best choice.

When Actors Memorize, They Add a Few Lines at a Time