I believe the correct answer is B. Spread by contact.
<span>B cells recognize their specific antigen on the surface of the invading pathogen or recognize toxins secreted by pathogens. Then, some B cells clone into memory B cells, while others multiply as plasma cells, which generate antibodies that bind to pathogens and block them from entering your healthy cells.</span>
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Answer: Vector
Explanation: the bite of an infected organism may transmit the pathogen from its reservoir to a human