Answer:
A. Activation of the complement system, a group of blood proteins that are activated in sequence to target the microbe for phagocytosis by macrophages and neutrophils, to disrupt the membrane of the microbe, and to produce an inflammatory response.
Step-by-step explanation:
Innate immune response is the first and non-specific response that is activated after the invasion of pathogens. It include barriers (skin, the gastrointestinal tract, the respiratory tract etc) that defend an organism of viruses, bacteria and other foreign organisms. It also includes defense mechanisms such as saliva, tears, mucus etc..
Innate immune response includes inflammation and activation of complement system.