Write the Expression as a Single Logarithm with Coefficient 1 $\log _ { 3 } t + \log _ { 3 } s$

Write the expression as a single logarithm with coefficient 1. Assume all variables represent positive real numbers.
- $\log _ { 3 } t + \log _ { 3 } s$

A) $\log _ { 3 } t \cdot \log _ { 3 } \mathrm {~s}$
B) $\log _ { 3 } \left( \frac { \mathrm { t } } { \mathrm { s } } \right)$
C) $\log _ { 3 } t \mathrm {~s}$
D) $\log _ { 3 } ( t + s )$