What is the relationship between exposure to a virus and developing an immunity to it?

The more you are exposed to a virus, the more your immunity develops to it as white blood cells are produced faster to help fight against it.

the answer is c: at the city park,it has two basketball courts, a playground, and a walking path.

different routes can lead to sammy to different places, with different roads.   if you check a map, you can see the routes.   try to make connections of the places and count how many there are.   hope this : )