单选题 设有表：order(订单号，客户号，职员号，签订日期，金额)
查询2007年所签订单的信息，并按金额降序排序，正确的SQL命令是
A) SELECT * FROM order WHERE YEAR(签订日期)=2007 ORDER BY 金额 DESC
B) SELECT * FROM order WHILE YEAR(签订日期)=2007 ORDER BY 金额 ASC
C) SELECT * FROM order WHERE YEAR(签订日期)=2007 ORDER BY 金额 ASC
D) SELECT * FROM order WHILE YEAR(签订日期)=2007 ORDER BY 金额 DESC