Doleful means something sad, or full of grief.
The direct opposite of this would be cheerful, which means happy.
Deceitful means dishonest or misleading, which is unrelated to "doleful."
Beautiful refers to something pleasing to the senses or mind and does not oppose "doleful."
Mournful is synonymous with "doleful" as it also means sad or full of sorrow.
Therefore, Option A is the correct answer.
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