As you are also communicating with B, B can only provide a less competitive price, but acceptable and a delivery time which is not the best but you can still negotiate. When you tell him that you have an order and you are asking him for lowering the price and adjusting the delivery time, he expresses his hope to invite us for visit and communication；
If it is time to make a decision, which one will be your choice?
Obviously, B is the better choice. Because the answers given by A sound unsure!
Therefore, what I’m going to talk about today, is the way to obtain customers’ trust: you should make an “effort” to invite your customers to visit your factory repeatedly.