In a primary immune response, the following stages take place. 1 Certain B-lymphocytes differentiate into plasma cells. 2 B-lymphocytes with the matching cell surface receptors undergo repeated mitotic division. 3 A specific antibody is synthesised. 4 T-helper cells release cytokines. 5 T-helper cells recognise a particular antigen. In what order do these stages happen?
- A2 → 1 → 4 → 3 → 5
- B2 → 4 → 3 → 1 → 5
- C5 → 4 → 2 → 1 → 3
- D5 → 4 → 3 → 1 → 2