Answer: A. is based on phagocytes and antimicrobials contained therein
Step-by-step explanation:
The innate immune system a person has is the one that they were born with to help them counter all foreign organisms as it views them as threats to the immune system.
It is based on phagocytes as well as natural antimicrobials that will immediately go into action once foreign organisms are detected in the body to eliminate any threats these organisms might pose.