Explanation
"Onerous" means burdensome or difficult to bear, so its antonym is "Light," which implies ease or lack of weight. "Difficult" and "Burdensome" are synonyms, not antonyms, while "Fluent" is unrelated. Thus, "Light" is the correct choice.
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"Onerous" means burdensome or difficult to bear, so its antonym is "Light," which implies ease or lack of weight. "Difficult" and "Burdensome" are synonyms, not antonyms, while "Fluent" is unrelated. Thus, "Light" is the correct choice.