Simplify the expression 2√ 20 - 3√ 7 - 2√ 5 + 4√ 63.

A. 2√ 20 - 4√ 7 - 2√ 5

B. 2√ 20 - 3√ 7 - 2√ 5 + 4√ 63

C. 2√ 20 - 3√ 7 + 4√ 63

D. 2√ 5 + 9√ 7

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