Subtract Write a Mixed Numeral for the Answer $7 \frac{7}{10}$ C) $6 \frac{17}{10}$

Subtract. Write a mixed numeral for the answer.
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A) 7
B) $7 \frac{7}{10}$
C) $6 \frac{17}{10}$
D) $6 \frac{7}{10}$