Find the Sum or Difference $7 a x ^ { 7 } \left( 2 a x ^ { 3 } - 2 x ^ { 2 } - 3 \right)$

Find the sum or difference.
- $7 a x ^ { 7 } \left( 2 a x ^ { 3 } - 2 x ^ { 2 } - 3 \right)$

A) $14 a x ^ { 21 } - 14 a x ^ { 14 } - 21 a x ^ { 7 }$
B) $14 a ^ { 2 } x ^ { 10 } - 14 a x ^ { 9 } - 21 a x ^ { 7 }$
C) $- 14 a ^ { 2 } x ^ { 21 } + 14 a x ^ { 14 } + 21 a x ^ { 7 }$
D) $- 14 a ^ { 2 } x ^ { 10 } + 14 a x ^ { 9 } + 21 a x ^ { 7 }$

Correct Answer:

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