Concept:Convert each decimal to scientific notation, multiply the decimal parts, and add the powers of 10.Explanation:Write 0.000215 as 2.15×10−4.Write 0.000028 as 2.8×10−5.Multiply the decimal parts: 2.15×2.8=6.02.Multiply the powers of 10: 10−4×10−5=10−9.So the product is 6.02×10−9.Answer:6.02×10−9 (Option D).