Which of these time measurements is the smallest?

Convert each measurement to seconds for a fair comparison. A is 0.02 seconds; B is 0.02 teraseconds, or 20 billion seconds; C is 2.5 seconds; and D is 25,000 nanoseconds, or 0.000025 seconds. Since 0.000025 seconds is the smallest, the answer is D, 25,000 nanoseconds.

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