The Calculator Graphs Shows The $x$ -Values of The $x$ -Intercepts of the Graph of the Polynomial in the Equation

Multiple Choice

The calculator graphs shows the $x$ -values of the $x$ -intercepts of the graph of the polynomial in the equation. Use the graphs to solve the equation.
- $4 \mathrm{x}^{2}-20 \mathrm{x}+21=0$

A) $\{-3.5,-1.5\}$
B) $\{-29,21\}$
C) $\{1.5,3.5\}$
D) $\{6,14\}$