After each of the following sentences, a list of possible interpretations is given. Choose the interpretation that you consider most appropriate for each sentence.
Mr. Juma kept his class on their toes so that they might not fail the examination. This means that Mr. Juma made his pupils

A. work very hard to pass  
B. keep standing in class
C. prepare for the examination
D. eager to make examinations

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Correct Answer: A