Answer: A. A posture disorder characterized by the shoulders being rounded and the back hunched.
Explanation:
Kyphosis a kind of disorder of the spinal cord. In this the spine gets curved outward which results in the abnormal rounding of the upper back. This condition is called as roundback and in cases of severe curvature this is called as hunchback. This condition can occur in any age but it is commonly seen in adolescence.