Use the Following to Answer Questions -(Table: Tonya's Production Function for Apples)Use Table: Tonya's Production Function

Use the following to answer questions : $$\begin{array}{l}\text { Table: Tonya's Production Function for Apples }\\\begin{array} { l c c } \hline \begin{array} { l } \text { Quantity } \\\text { of Land } \\\text { (hectares) }\end{array} & \begin{array} { c } \text { Quantity } \\\text { of Labour }\end{array} & \begin{array} { c } \text { Total } \\\text { Product } \\\text { (apples picked) }\end{array} \\\hline 10 & 0 & 0 \\10 & 1 & 8 \\10 & 2 & 15 \\10 & 3 & 21 \\10 & 4 & 26\end{array}\end{array}$$
-(Table: Tonya's Production Function for Apples) Use Table: Tonya's Production Function for Apples.The marginal product of the fourth worker is _____ apples.

A) 7
B) 26
C) 5
D) 21