Table 91 -Refer to Table 9

Table 9.1
$$\begin{array} { | c | c | c | } \hline \text { Quantity } & \text { Price } & \text { Total Revenue } \\&\text { (dollars) } & \text { (dollars) } \\\hline 1 & 7.50 & 7.50 \\\hline 2 & 7.00 & 14.00 \\\hline 3 & 6.50 & 19.50 \\\hline 4 & 6.00 & 24.00 \\\hline 5 & 5.50 & 27.50 \\\hline 6 & 5.00 & 30.00 \\\hline\end{array}$$
-Refer to Table 9.1.The marginal revenue of the 3rd unit is ______.

A) $6.50
B) $5.50
C) $1.83
D) $0.50