Some events in the primary immune response are shown below. 1. a foreign microbe is phagocytosed by a macrophage and antigen presentation occurs 2. some T-lymphocytes become T-killer cells, which destroy infected body cells 3. the T-helper cell undergoes mitosis to form T-lymphocyte clones 4. a T-helper cell with the complementary receptor binds to the antigens that are being presented What sequence of events is correct during the primary immune response?
- A4 → 1 → 3 → 2
- B1 → 4 → 3 → 2
- C3 → 1 → 4 → 2
- D3 → 4 → 1 → 2