-The Maximum Units of Input You Would Possibly Hire Is

Multiple Choice

$$\begin{array}{l}\begin{array} { cc } \text { Units of Input}&\text { Units of Outputs }\\1 & 3 \\2 & 7 \\3 & 10 \\4 & 12 \\5 & 13 \\6 & 12\end{array}\end{array}$$
-The maximum units of input you would possibly hire is

A) 2.
B) 3.
C) 4.
D) 5.
E) 6.