Answer:
There are 3 big dogs for every 2 small dogs.
Explanation:
It is given that,
The ratio of big dogs to small dogs in a park is 3 : 2.
We need to find the correct sentence for this given statement. Let there are 3x big dogs and 2x small dogs. It is a problem of ratio. Ratio gives how many times one number contains another.

It means that there are 3 big dogs for every 2 small dogs. Hence, the correct option is (b).