Consider these three numbers expressed in scientific notation: 2.4 × 104, 6.3 × 105, and 9.6 × 107. Which number is the greatest, and by how many times is it greater than the smallest number? A. The greatest number is 9.6 × 107. It is 400 times greater than the smallest number. B. The greatest number is 6.3 × 105. It is 40 times greater than the smallest number. C. The greatest number is 6.3 × 105. It is 400 times greater than the smallest number. D. The greatest number is 9.6 × 107. It is 4,000 times greater than the smallest number.