Round to the Nearest Thousandth $7^{3 x} = 8 ( x + 1 )$

Multiple Choice

Round to the nearest thousandth.
- $7^{3 x} = 8 ( x + 1 )$

A) $\{ 1.069 \}$
B) $\{ 2.069 \}$
C) $\{ - 15.573 \}$
D) $\{ 0.553 \}$