Ever since he suffered a brain injury by falling from a ladder, zack’s wife has continued to tell the doctor that zack’s personality has changed. he used to be fun loving and carefree, but he is now more critical and yells at the children for little reason. zack is likely to have suffered damage to the of his cortex.
(a)- frontal lobe
(b)- parietal lobe
(c)- occipital lobe
(d)- temporal lobe.

a)- frontal lobe

Explanation:

Frontal lobe is present at front of each hemisphere and is the largest lobe in mammals. It controls cognitive skills in humans. These skills include judgement, language, emotional expression, problem solving, ability to communicate etc. Hence, it basically controls our personality.

After Zack's brain injury his personality changed. He became more critical and aggressive while earlier he used to be carefree and fun loving. Hence he has likely suffered damage to frontal lobe of his cortex.