Use Graphical Methods to Solve the Linear Programming Problem $\quad z=0.18 x+0.12 y$

Multiple Choice

Use graphical methods to solve the linear programming problem.
-Minimize $\quad z=0.18 x+0.12 y$
Subject to: $\quad 2 x+6 y \geq 30$
$4 x+2 y \geq 20$
$x \geq 0$
$y \geq 0$

A) Minimum of 1.08 when $x=4$ and $y=3$
B) Minimum of 1.86 when $x=9$ and $y=2$
C) Minimum of 1.2 when $x=4$ and $y=4$
D) Minimum of 1.02 when $x=3$ and $y=4$