Gerald is lightheaded and tired from a lack of oxygen in his tissues.

What is most likely the reason he feels this way?

His plasma level is high.

His white blood cell count is high.

His platelet count is low.

His red blood cell count is low.

His red blood cell count is low. When this happens within the body, oxygen-rich blood is not delivered within the different organ systems. The lack of oxygen-rich blood results to symptoms like lightheadedness and feeling of being tired. He should stop the activity that he's doing and drink the necessary medications to prevent further complications from happening.