At this point, it is impossible to know where B is going without a specific context. Let's say B is holding a briefcase, and A immediately wants B to go to the bank; If B brings a lot of food and the weather is good, then A hears the word bank and thinks of bank. B We're going to have a picnic by the river. Obviously, without the help of context, this sentence is ambiguous. Accurate information can only be obtained when the context is clear.