Stress is everywhere and everybody has to _____face it.Actually stress isn’t as bad as it        .

A．is supposing to be

B．supposed to

C．supposes to be

D．is supposed to be

我国某公司与日本进行一笔煤炭出口，合同规定“成交中国煤炭1000公吨，5％增减，由卖方选择，增减部分按合同价格结算”。货物运抵日本后，经日本海关检查发现煤炭实际吨数为10500公吨。据此日商提出降价5％的要求，否则拒收多交的500公吨煤炭。请问日商做法是否合理？