mediumFPSCNTSCSSPPSCEnglish Vocabulary
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Correct Answer: D: Out-of-sync
Explanation: The correct answer is D: Out-of-sync. The antonym of KILTER (proper alignment or balance) is Out-of-sync. When something is 'in kilter' it is properly balanced; 'out of kilter' or 'out-of-sync' means misaligned or off-balance.