Refer to the Following -What Is the Marginal Cost of the 250th Unit of }

Refer to the following:

$\begin{array}{ccccccccc} & & \text { Total } & \text { Total } & \text { Average } & \text { Average } & \text { Average } & \\& \text { Total } & \text { Fixed } & \text { Variable } & \text { Fixed } & \text { Variable } & \text { Total } & \text { Marginal } \\\text { Output } & \text { Cost } & \text { Cost } & \text { Cost } & \text { Cost } & \text { Cost } & \text { Cost } & \text { Cost }\\\hline 100&560&-&60&-&-&-&-\\200&-&-&-&-&-&-&4.00\\300&-&-&-&-&4.00-&-&-\\400&-&-&-&-&-&7.00&-\\\end{array}$
-What is the marginal cost of the 250th unit of output?

A) $0.14
B) $2.40
C) $4.00
D) $7.40
E) none of the above