Use the Following Table to Answer the Question Below: the Amount

Multiple Choice

Use the following table to answer the question below: The amount of total output produced from various combinations of labor and capital. $$\begin{array} { c c c c c c } & & { \text { Units af Capital } } \\ & & 1 & 2 & 3 & 4 \\& 1 & 50 & 120 & 160 & 180 \\\text { Units } & 2 & 110 & 260 & 360 & 390 \\\text { of } & 3 & 150 & 360 & 510 & 560 \\\text { Lebor } & 4 & 170 & 430 & 630 & 690 \\& 5 & 160 & 480 & 710 & 790\end{array}$$ If the capital stock is fixed at one unit,how much does the third unit of labor add to total output?

A) 20
B) 40
C) 60
D) 80
E) none of the above