The correct answer is D. happy.
A querulous person is one who is always complaining or grumbling. They are often negative and pessimistic, and they find fault with everything. The opposite of querulous is happy, which means feeling or showing pleasure or contentment. A happy person is usually positive and optimistic, and they find joy in the simple things in life.
Option A, bright, means having or reflecting a lot of light. It can also mean intelligent or clever. Option B, splendid, means very impressive or excellent. Option C, smart, means intelligent or clever. While these words may be positive, they do not convey the opposite of querulous. A querulous person is not necessarily
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