Estimate the Value of the Quantity $5.7 \mathrm { mg }$

Estimate the value of the quantity.
-The table gives dye concentrations for a cardiac-output determination. The amount of dye injected was $5.7 \mathrm { mg }$ . Plot the data and connect the data points with a smooth curve. Find the area under the curve using rectangles. Use this area to estimate the cardiac output.
$\begin{array}{c|c}\begin{array}{c}\text { Seconds } \\\text { after } \\\text { injection }\end{array} & \begin{array}{c}\text { Dye Conc. } \\\text { (adjusted for } \\\text { recirculation) }\end{array} \\\hline 0 & 0 \\2 & 0.2 \\4 & 0.7 \\6 & 1.9 \\8 & 4.3 \\10 & 4.1 \\12 & 2.5 \\14 & 1.2 \\16 & 0.8 \\18 & 0.2 \\20 & 0\end{array}$

A) $21.5 \mathrm {~L} / \mathrm { min }$
B) $334.7 \mathrm {~L} / \mathrm { min }$
C) $10.8 \mathrm {~L} / \mathrm { min }$
D) $0.2 \mathrm {~L} / \mathrm { min }$