Solve the Problem $104.7$ Times More Powerful Than a Reference Level Earthquake, Or

Multiple Choice

Solve the problem.
-An earthquake had an intensity $104.7$ times more powerful than a reference level earthquake, or $104.7$ . $\mathrm { I } _ { 0 }$ . What was the magnitude of this earthquake on the Richter scale? $\mathrm { R } = \log _ { 10 } \left( \mathrm { I } / \mathrm { I } _ { 0 } \right)$ .

A) $4.7$
B) $10.8$
C) $14.7$
D) $5.3$