Determine the Degree of the Polynomial $3 x ^ { 6 } - 9 x ^ { 7 } + 10 x ^ { 2 } - 8$

Determine the degree of the polynomial.
- $3 x ^ { 6 } - 9 x ^ { 7 } + 10 x ^ { 2 } - 8$

A) 6
B) 4
C) 15
D) 7