Jared received a head injury at work and later had trouble speaking and planning ahead. Which are of his brain was most likely damage: a) parietal lobes b) temporal lobes c) thalamus d) frontal lobes.

d. Frontal lobe

Explanation:

In the frontal lobes, Broca's speech area is located. These regions are present close to the lateral cerebral sulcus. Broca's speech area is involved in speaking and understanding language. Mostly, the planning and production of speech occur in the left frontal lobe as nerve impulses from these lobes are delivered to the premotor region which in turn regulates muscles of the larynx, pharynx, and mouth. Therefore, any damage to frontal lobes hampers the ability to speak and planning ahead.