Correct Answer:
C. Diminish
The word ABATE means to become less intense, widespread, or severe. Therefore, Diminish is the most accurate synonym, as it means to make or become less. For instance, a storm might abate, meaning its intensity diminishes. Option A, Postpone, means to delay an event, which is distinct from reducing its force or degree. Option B, Abandon, implies giving up entirely or leaving something, a much stronger action than merely lessening. Option D, Increase, is a direct antonym, meaning to make something greater in size, amount, or intensity. Understanding 'abate' helps in recognizing situations where something is subsiding or decreasing in magnitude.