The correct answer is Option (3) → Effortless
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Onerous means something that is difficult, heavy, or burdensome.
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Effortless means requiring no effort, which is the direct opposite of burdensome.
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Arduous: A synonym for onerous, meaning involving or requiring strenuous effort; difficult and tiring.
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Opulent: Meaning rich and luxurious or lavish, which is unrelated to the difficulty of a task.
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Favourable: Meaning expressing approval or promising good results, which is a different concept from being easy or difficult.
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