To provide vaccine to the people against disease under the a. curative heath service
b. promotive health service
c. preventive health service
d. rehabilitatives health service​

C, This is my answer as preventing is better than curing at the end.

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there