The correct answer is A. helpful.
A friendly dog is likely to be helpful, as it may greet you with a wagging tail and lick your face. It may also bark to let you know that someone is coming, or lead you to the owner of the farm.
A helpful dog is one that is willing to do things to make your life easier. For example, a helpful dog might bring you your slippers when you’re cold,
or fetch the newspaper for you.A friendly dog is one that is kind and affectionate. It is likely to enjoy being around people and other animals, and will be happy to see you.
A helpful
dog is not necessarily a friendly dog, and vice versa. For example, a service dog may be very helpful, but it may not be friendly to strangers. Similarly, a guard dog may be friendly to its owner, but it may be hostile to strangers.A quiet dog is one that does not make a lot of noise. It may be calm and relaxed, or it may be shy.
A hostile dog is one that is aggressive or unfriendly. It may bark, growl, or snap at people or other animals.
In the context of the question, the dog is described as “friendly.” This means that it is likely to be helpful and kind, rather than quiet or hostile.