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【单选题】
下列选项中用于判断ch是否是英文字母的表达式是（ ）。A.
( ch >= 'a' && ch <= 'z' ) || ( ch>= 'A' && ch <= 'Z' )
B.
( 'a' <= ch <='z' ) || ( 'A' <=ch <='Z' )
C.
( 'a' <= ch <='z' ) && ( 'A' <=ch <='Z' )
D.
( ch >= 'a' && ch <= 'z' ) && ( ch>= 'A' && ch <= 'Z' )
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