Answer:
The correct answer is D. Fluid-filled sacs intended to minimize friction between tissue and bone can become inflamed: when this happens, the condition is called bursitis.
Step-by-step explanation:
Bursitis is the inflammation of the bursa, a bag-shaped structure that is located between bones, tendons and muscles, aimed at facilitating the movement of these structures with each other.
Due to the inflammatory process the bursa begins to accumulate a significant amount of liquid. This condition can be acute or chronic. Commonly, it occurs in the area of the shoulder, knee, elbow, hip or Achilles tendon.