Correct the inappropriate shift in verb mood in the following sentence: “If he studies hard, he will pass the test, and he would be happy.”
A. If he studies hard, he will pass the test, and he will be happy.
B. If he studies hard, he would pass the test, and he will be happy.
C. If he studies hard, he will pass the test, and he could be happy.
D. If he studies hard, he would pass the test, and he would be happy.

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