Answer:
B. pediatrics
Step-by-step explanation:
Specialization means focusing on one or a few areas of study, work, or production. A business or an individual concrete on the field where they have a comparative advantage. Specialization increases efficiency as the individual become experts in a particular area. As experts, their productivity increase as they use few resources to achieve a high standard of performance.
Pediatric is a specialized branch of medicine that caters to children. A pediatrician is an expert doctor focusing on treating children, which is specialization. A hospital, a general practitioner, and an organization are broad terms that don't point a specific line of activity.