Jim steele lost his arm in a roadside bomb explosion while on military service in iraq. now, when he shaves, he feels the movement of the razor against his cheek and, at the same time, he feels stroking on his missing arm. at the va, jim is diagnosed with phantom limb syndrome, a disorder due to plasticity in his

Parietal lobe.

Explanation:

Parietal lobe may be defined as one of the lobe among the four lobes of cerebral cortex of brain. The main function of parietal lobe is to discriminate between the two points and the sensation of touch.

Phantom Limb Syndrome may be defined as the medical condition in which the individual experiences pain sensation in the limb. This syndrome mainly occur due to the plasticity of the parietal lobes. Jim feel strokes on his arm due to the this disease because of the dis functioning of parietal lobes.

Thus, the answer is parietal lobe.

out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.