Write the Equation in Its Equivalent Logarithmic Form $7 ^ { x } = 343$

Multiple Choice

Write the equation in its equivalent logarithmic form.
- $7 ^ { x } = 343$

A) $\log _ { 343 } 7 = x$
B) $\log _ { 7 } 343 = x$
C) $\log _ { 343 } x = 7$
D) $\log _ { \mathrm { x } } 343 = 7$