Sahar Does Not Have Medical Insurance and Pays All Her

Sahar does not have medical insurance and pays all her medical bills out of pocket. Her demand schedule for chiropractic visits is shown in the table below.
$\begin{array}{|l|l|}\hline \text {Price, \$ per Visit }& \text {Number of Visits per Month} \\\hline 0 & 10 \\\hline 5 & 9 \\\hline 10 & 8 \\\hline 15 & 7 \\\hline 20 & 6 \\\hline 25 & 5 \\\hline 30 & 4 \\\hline 35 & 3 \\\hline 40 & 2 \\\hline 45 & 1 \\\hline 50 & 0 \\\hline\end{array}$
-Sahar responds only to her out of pocket payment when deciding how many office visits to make. Assume Sahar obtains insurance coverage which requires her to pay 20% of the price per visit. At a price of $50, how many office visits will Sahar make?

A) 10.
B) 8.
C) 6.
D) 4.
E) 0.