Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Solve the equation.
- $49 ^ { x + 8 } = 7 ^ { 4 x }$

A) $\{ 8 \}$
B) $\left\{ \frac { 10 } { 3 } \right\}$
C) $\left\{ - \frac { 56 } { 3 } \right\}$
D) No solution