Answer:
The correct answer is: marking or tagging pathogens so phagocytes can find and ingest them.
Explanation:
Opsonins are proteins of great importance in our immune system that can intervene in the innate and the adaptative immune response thanks to the complement system.
Opsonins can recognize pathogens or diseased cells and bind to their surface molecules, thus marking them for other cells (particularly phagocytes such as macrophages and neutrophils) to phagocyte (eat) them. This process is hugely important in removing potential threats and non-functioning cells.
