V06 # Q40

A controversial study suggests that the violent behavior displayed by some teenagers who play several hours of video games a day is due to developmental damage to the frontal lobe region of the brain rather than the absorption of any specifically violent content.

a) is due to developmental damage to the frontal lobe region of the brain
b) are due to developmental damage to the frontal lobe region of the brain
C) is due to damage to the developmental frontal lobe region of the brain
D) are due to developmental damages to the brain’s frontal lobe
E) is due to developmental damages to the brain’s frontal lobe region

It's obvious to eliminate b) and d) by Subject-V agreement (singular and phural).
To determine the correct answer from a&c&e) is difficult. Pls help explain