The skull protects the brain from injury. Red blood cells carry oxygen to the bones. The skull supports the eyes in their sockets. Red blood cells carry oxygen to the muscles.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The major organ systems in the human body interact in many ways. Which of the following statements describes one way that the skeletal system interacts with the circulatory system?
Possibilities:
- The skull protects the brain from injury.
- Red blood cells carry oxygen to the bones.
- The skull supports the eyes in their sockets.
- Red blood cells carry oxygen to the muscles.

Red blood cells carry oxygen to the bones.