b. Explain why this algorithm works. Choose the correct answer below. A. The sum of any three two-digit numbers formed from two three-digit numbers is always equal to the sum of those two three-digit numbers. B. The placement of partial sums under their addends accounts for place value. C. Finding one partial sum at a time eliminates the possibility of intermediate mistakes. D. None of the partial sums were found by adding two of the same number.

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