The reason behind this is the slower population growth. Thus, option B is correct.
Communicable disease is defined as the disease which transfers from one person to another person. It is also known as infectious disease which results into illness.
The pathogens (disease causing organisms) are developed in the body leads to infection and serious illness.
The diseases which comes in the category of communicable disease are cholera, malaria, and chickenpox.
Therefore,the reason behind this is the slower population growth. Thus, option B is correct.
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