[tex]\begin{gathered} \text{The formula for volume of cylinder is as follows,} \\ V=\pi r^2h \\ \text{Here,r}=6in\text{ is the radius, and h=18in is the height} \\ So, \\ V=\pi\times6^2\times18 \\ V=2035.75in^3 \\ \text{First option is correct.} \end{gathered}[/tex]