Find the Sum or Difference $( 7 p - 1 ) \left( 49 p ^ { 2 } + 7 p + 1 \right)$

Multiple Choice

Find the sum or difference.
- $( 7 p - 1 ) \left( 49 p ^ { 2 } + 7 p + 1 \right)$

A) $343 p ^ { 3 } - 1$
B) $49 p ^ { 3 } - 1$
C) $343 p ^ { 3 } + 56 p ^ { 2 } - 1$
D) $343 p ^ { 3 } + 1$