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jazzwok
D.

Before a test could be because you're unsure of how you will do.

During a test because you're unsure of how well you're doing or if you're getting the correct answers.

After a test could be because you're unsure of how well you did and what score you'll get on it.

Answer:

the answer is (any of these) D

Explanation:

it happens do to the persons stress and wories so it can very to any one