Correct Answer - Option 4 : Brutal
The correct answer is Brutal.
Let's look at the meaning of the given word and the correct option.
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Humane: Having or showing compassion or benevolence.
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Brutal: Savagely violent.
From the given meanings it is clear that both the words express the opposite meanings and are therefore antonyms.
Thus the correct answer is Brutal.
Let's look at the meanings of the other given options.
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Reasonable: Having sound judgement, fair and sensible.
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Kind: Having or showing a friendly, generous, and considerate attitude.
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Rational: Based on or in accordance with reason.