Multiply 0.004 by 500.<br><br>
&bull; 0.004 × 500 = 4 × 10<sup>-3</sup> × 5 × 10<sup>2</sup><br>
&bull; = 4 × 5 × 10<sup>-1</sup> = 20 × 0.1 = 2<br>
&bull; Or: 0.004 × 500 = 4/1000 × 500 = 4 × 0.5 = 2<br>
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Final Answer: B: 2