To answer this question we will use the following formula to compute the surface area of a rectangular prism:
[tex]\begin{gathered} SA=2(wl+hl+hw), \\ \text{where w is the width of the rectangular prims, l is its length, and h is its height.} \end{gathered}[/tex]
Substituting w=3m, h=2m, and l=9m we get:
[tex]SA=2(3m\cdot9m+2m\cdot9m+2m\cdot3m)\text{.}[/tex]
Simplifying the above result we get:
[tex]\begin{gathered} SA=2(27m^2+18m^2+6m^2), \\ SA=2(51m^2), \\ SA=102m^2\text{.} \end{gathered}[/tex]
Answer: Option D.
