Use a Graphing Calculator to Estimate the Solution Set of the Equation

Multiple Choice

Use a graphing calculator to estimate the solution set of the equation. Round to the nearest hundredth.
- $9 \mathrm { e } ^ { 2.1 \mathrm { x } } = 43$

A) $\{ 0.74 \}$
B) $\{ 3.28 \}$
C) $\{ 4.69 \}$
D) $\{ 1.56 \}$