The magnitude, $M$, of an earthquake is defined to be $M=\log \frac{I}{S}$, where $I$ is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and $S$ is the intensity of a "standard" earthquake, which is barely detectable. What is the magnitude of an earthquake that is 35 times more intense than a standard earthquake? Use a calculator. Round your answer to the nearest tenth.

A-0.5

B-1.5

C1.5

D3.6