The student who caught the cold caused by this specific Rhinovirus was exposed to the exact same Rhinovirus 18 months later. Memory B cells of the immune system will protect her from getting the same cold again.
In immunology, a memory B cell (MBC) is a type of B lymphocyte that forms part of the adaptive immune system. These cells develop within germinal centres of the secondary lymphoid organs. 
Memory B cells circulate in the blood stream in a quiescent state, sometimes for decades. Their function is to memorize the characteristics of the antigen that activated their parent B cell during initial infection such that if the memory B cell later encounters the same antigen, it triggers an accelerated and robust secondary immune response. 
Memory B cells have B cell receptors (BCRs) on their cell membrane, identical to the one on their parent cell, that allow them to recognize antigen and mount a specific antibody response.
Learn more about  memory B cell here : brainly.com/question/23423029
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Its internal mainly because none of the other words fit and because what happens with the rumbling and vomitting its INTERNAL
hope this helped plz mark brainliest if u can
        
                    
             
        
        
        
Answer:
1. Answer is B.
Explanation:
2. Bro this is something for the physics section, not biology.
 
        
             
        
        
        
Answer:
C) cell bodies of sensory neurons
Explanation:
The dorsal root ganglia mainly contain cell bodies of sensory neurons.
See attachment for better visual understanding.