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The diagram shows three lines of equal potential on a grid. Each square in the grid is $1.00\text{ cm}$ on a side. The equipotential line (isoline) on the left has a value of $80\text{ volts}$. The middle and right equipotential lines are not labeled. The electric field near the star has an average value of $2{,}000\text{ V/m}$ and is directed to the right.

Which of the following is the value of the equipotential line in the middle?

A

$40\text{ V}$

B

$120\text{ V}$

C

$0\text{ V}$

D

$2{,}080\text{ V}$

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