单选题

页面中包含name为"selCity"的下拉狂，下面清空该下拉框的JavaScript代码最可能正确的是 ( )

Question

A. document.myform.selCity.options.size = 0;

B. document.myform.selCity.options.length = 0;

C. document.myform.selCity.options.ClearAll( );

D. document.myform.selCity.options.deleteAll( );