A Teacher Gave His Class a Brief Quiz to Assess

A teacher gave his class a brief quiz to assess their knowledge. On the basis of this test, he gave extra tuition to the pupils who finished in the lower 50% of the class. After one month, he gave them another quiz. He found that the pupils who received the extra tuition improved more than the other pupils. Why might the teacher have observed this apparent difference in improvement?

A) Testing effect
B) Crossover effects
C) Differential mortality
D) Regression towards to the mean

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