Correct option is B
Explanation:
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Beneficial means
helpful or advantageous.
Synonyms of beneficial: helpful, advantageous, profitable, useful.
Antonyms of beneficial: harmful, detrimental, damaging, disadvantageous.
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Detrimental (Correct) means
harmful or causing damage, which is the opposite of "beneficial".
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Incorrect options:
·
Advantageous (Similar in meaning)
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Causal (Related to cause, not opposite)
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Desirable (Means wanted, not opposite)
Correct answer:
Detrimental