In a pet store
There are 8 puppies, 10 kittens and 6 parakeets.
The total number of pets, i.e total outcome is

Let P represent puppies
Let K represent kittens and
Let Pa represent parakeets
The formula to find probability is

The probability of choosing a puppy, i.e P(P) is

The probability of choosing a kitten, i.e P(K) is

The probability of choosing a puppy or a kitten, P(P or K) is

The probability of choosing a puppy or a kitten, P(P or K) is 3/4
Hence, the right option is B