OBSTREPEROUS (Any obstreperous plan will only booberang on you)
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PREPONDOUROUS
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CALOUS
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OBSTRUCTIVE
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DESCRIPTIVE
C
Correct answer
Explanation
Obstreperous means unruly, noisy, and difficult to control - literally someone who creates obstruction or trouble. The context suggests a troublesome plan will backfire. Obstructive captures this sense of creating problems or resistance. Preponderous is a misspelling of preposterous; callous should be callous.