Solve the Problem $V(x)$ (In Arbitrary Energy Units) Stored in a Large Rubber Band

Solve the problem.
-The graph shows the amount of potential energy $V(x)$ (in arbitrary energy units) stored in a large rubber band that is stretched a distance of $x$ inches beyond its relaxed length.
The magnitude of the force required to hold the rubber band at the position $\mathrm{x}=\mathrm{a}$ is the derivative of the potential energy with respect to $x$ , evaluated at the point $x=a$ . Estimate the force required to hold the band at a stretched position $x=7$ . (Hint: the force in this problem has units of "energy units per inch".)

A) -0.6 energy units per inch
B) 1.6 energy units per inch
C) 2.7 energy units per inch
D) 3.4 energy units per inch