Which ones of the following statements are in the counter-offer letter.
选项：

A:We have considered your proposal to pay by a 30days L/C, but we usually accept sight L/
B:We are in the market for melon seeds of first grade, and should be appreciated if you let us have your offers.
C:We regret to say that we find your price rather high and have a hard time convicing our clients at your price.
D:Should you be ready to reduce your price by 5%, we might come to business.