Use the Following Dataset to Answer the Following Question -What Is the Unit of Observation?
A) Panel
B) State

Use the following dataset to answer the following question. $$\begin{array} { | l | c | c | c | c | } \hline { \text { State } } & \text { Year } & \text { Sales Tux } & \text { Salesper Stare } & \begin{array} { c } \text { Ermplayees per } \\\text { Stare }\end{array} \\\hline \text { Indiaraa } & 2014 & 7.25 & \$ 650,000 & 50 \\\hline \text { Illinois } & 2014 & 7.75 & \$ 625,000 & 65 \\\hline \text { Indiara } & 2015 & 8.00 & \$ 800,050 & 75 \\\hline \text { Illinois } & 2015 & 8.75 & \$ 525,000 & 55 \\\hline\end{array}$$
-What is the unit of observation?

A) Panel
B) State
C) Sales-employee per store
D) State-year