When a pathogen gets into the blood, the number of white blood cells rises. Some possible explanations for this are given below. 1 It raises the amount of antibodies. 2 It raises the transport of oxygen. 3 It raises phagocytosis. 4 It raises the number of platelets. Which explanations are correct?
- A1 and 3
- B1 and 4
- C2 and 3
- D2 and 4