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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.