A. our production will be based on the demandB. That's what worries me these daysC. It seems that we can only find out the reason from consumers' preferenceJoe: Hi, John, have you found that our sales volume of detergent has dropped a lot in the recent three months?John: Yeah.【D1】______. Anything wrong with our product?Joe: In my opinion, our detergent is of good quality. 【D2】______.John: Sounds reasonable. We should listen to our customers.Joe: I agree with you. We are planning to conduct a marketing survey in order to make out why consumers accept or refuse our detergent. Then we can plan the marketing policy. That's to say, 【D3】______.John: Great. Try to get consumers' opinion about the price of our detergent as well as their preference for the smell.Joe: OK, we will pay more attention to that.