SC - Smoking Habit

[mygmat800]

In surprising medical news, scientists investigating long-term effects of stroke are reporting that injury to a specific part of the brain, located behind the ear, can instantly and permanently break a smoking habit.

A brain, located behind the ear, can instantly and permanently break a smoking habit
B brain located behind the ear can instantly and permanently break a smoking habit
C brain, located behind the ear, can instantly and permanently break the habit of smoking
D brain located behind the ear, can instantly and permanently break a smoking habit
E brain, the one located behind the ear, can instantly and permanently break the habit of smoking

I chose C over A because I thought in "smoking habit", the modifier and modified are swapped. It sounds as if "a habit that smokes." While C clearly states - habit of smoking.

Is my reasoning flawed?

[mygmat800]

Source: GMATClub Challenges. I hopes its not one of the banned sources :)