The Lists Below Show Five Agricultural Crops in Alabama, Arkansas

The lists below show five agricultural crops in Alabama, Arkansas, and Louisiana.
$\begin{array} { l l l } \underline { \text { Alabama } } & \underline { \text { Arkansas } } & \underline { \text { Louisiana } } \\\text { soybeans (s) } & \text { soybeans (s) } & \text { soybeans (s) } \\\text { peanuts (p) } & \text { rice (r) } & \text { sugarcane (n) } \\\text { corn (c) } & \text { cotton (t) } & \text { rice (r) } \\\text { hay (h) } & \text { hay (h) } & \text { corn (c) } \\\text { wheat (w) } & \text { wheat (w) } & \text { cotton (t) }\end{array}$
Let U be the smallest possible universal set that includes all of the crops listed, and let A, K and L be the sets of five crops in Alabama, Arkansas, and Louisiana, respectively. Find each of the following sets.
- $\mathrm { K } \cup \mathrm { L }$

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