使用SQL语句实现从"Websites"表中选取alexa排名大于"15"且国家为"CN"或"USA"的所有数据,以下写法正确的是?
A.SELECT*FROMWebsitesWHERE(alexa>15ANDcountry='CN')ORcountry='USA';
B.SELECT*FROMWebsitesWHEREalexa>15AND(country='CN'ORcountry='USA');
C.SELECT*FROMWebsitesWHEREalexa>15ANDcountry='CN'ORcountry='USA';
D.SELECT*FROMWebsitesWHEREalexa>15OR(country='CN'ORcountry='USA');