A、You could increase your order to 3,000 pieces, we would allow a 5% discount
B、We are of the opinion that if you could increase your order to 3,000 pieces, we would allow a 5% discount
C、We are of the opinion that if you could rise your order to 3,000 pieces, we would allow a 5% discount
D、We are of the opinion that if you could increase your order by 3,000 pieces, we would allow a 5% discount