Solve the Problem $$D = 10 \cdot \log \left( I \times 10 ^ { 12 } \right)$$

Multiple Choice

Solve the problem.
-The level of a sound in decibels is calculated using the formula
$$D = 10 \cdot \log \left( I \times 10 ^ { 12 } \right)$$
where $I$ is the intensity of the sound waves in watts per square meter. A electric shaver puts out $0.0001$ watt per square meter. How many decibels is that?

A) $- 40$
B) 8
C) 800
D) 80