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

Use the following dataset to answer the following question. $$\begin{array} { | l | c | c | c | c | } \hline { \text { Firm } } & \text { Year } & \text { \# ur Emplayees } & { \text { Sales } } & \text { Prafits } \\\hline \text { Jirr's Auto } & 2014 & 23 & \$ 741,000 & \$ 52,000 \\\hline \text { Mecharnic Zone } & 2014 & 15 & \$ 510,000 & - \$ 72,000 \\\hline \text { Tirr's Auto } & 2015 & 31 & \$ 1,081,050 & \$ 101,000 \\\hline \text { Mecharic Zone } & 2015 & 27 & \$ 81,000 & \$ 28,000 \\\hline\end{array}$$
-What is the unit of observation?

A) Firm
B) Year
C) Year-Profits
D) Firm-Year