(Table) If the Numbers in the Table Were Placed on a Graph

(Table) If the numbers in the table were placed on a graph, with hot chocolate sales on the vertical axis and temperature on the horizontal axis, the slope would be: $$\begin{array} { | c | c | } \hline \text { Temperature } & \text { Hot Chocolate Sales } \\\hline 25 & 100 \\\hline 30 & 90 \\\hline 35 & 80 \\\hline 40 & 70 \\\hline 45 & 60 \\\hline 50 & 50 \\\hline 55 & 40 \\\hline\end{array}$$

A) +2
B) -1/2.
C) -2.
D) -10.