Let $\mathrm{U}$ Be the Smallest Possible Universal Set That Includes All of All

Let $\mathrm{U}$ be the smallest possible universal set that includes all of the crops listed; and let $\mathrm{A}, \mathrm{K}$ , and $\mathrm{L}$ be the sets of five crops in Alabama, Arkansas, and Louisiana, respectively. Find the indicated set.
- $\mathrm{K}^{\prime} \cap \mathrm{L}$

A) $\{\mathrm{h}, \mathrm{w}\}$
B) $\{r, s, t\}$
C) $\{c, n\}$
D) $\{\mathrm{c}, \mathrm{n}, \mathrm{p}\}$