Answer:
Frontal lobe
Step-by-step explanation:
The frontal lobe is the portion of the cerebral cortex that is involved in the process of, consciousness, thinking, attention, memory, sexual behavior, and personality traits. The frontal lobe is present in the front part of the brain.
In the given question, since Brad is not able to maintain his attentive behavior, not able to plan which requires thinking, and also mot able to move his right arm shows that the affected part of the brain is the frontal lobe.
Thus, the Frontal lobe is the correct answer.