The Relationship Between Labor Usage and Output at the Local

The relationship between labor usage and output at the local coffee shop is summarized in the table below.The price of a cup of espresso is $1.25 and no other inputs are required. $\begin{array}{cc}\begin{array}{c}\text { Labor } \\ \underline {\text { Input }}\end{array} & \begin{array}{c}\text { Cups of } \\ \underline {\text { espresso }}\end{array} \\ 0 & \text { 0 } \\1 & 25 \\2 & 45 \\3 & 60 \\4 & 70 \\5 & 75\end{array}$
The value of marginal product for the first worker is _______.

A) 25 cups of espresso
B) $31.25
C) $25
D) $20