A. There is no dog in Nick's family because

1. The text states Nick's parents prefer dogs but haven't got one because they both work and Nick spends a lot of time at school and playing tennis. This implies a lack of time to look after a dog.
2. Option 1 is incorrect as the text doesn't mention disliking dogs.
3. Option 2 is incorrect as having a cat doesn't explain the absence of a dog.Final Answer: 3) they have not got time to look after a dog.