Answer:
B: The virus has a long period of latency
 
        
             
        
        
        
Mitochondria produce ATP, energy that is vital in aerobic cells. Therefore, I believe this is why they can be considered as power plants.
        
             
        
        
        
The difference between the two diseases that could lead to the same basic reproduction number is : One disease has lower transmission rate and a longer recovery period than the other. ( B )
Basic reproduction number ( r0) represents the number of people who gets infected through an infected person, and for a disease to be highly infectious its ( r ) number will have to higher than 1. and The value of r0 is determined based on certain factors which are : 
- The Infectious period 
- contact rate and mode of transmission 
Therefore for the  two viral diseases to have the same basic reproduction number one of the disease will have a lower transmission rate and a longer recovery period than the other 
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