单项选择题
In a web page with chechboxes you need to write e jquery that retruns the number checked checkboxes.（）
A.var n = $（“input：checked”）.length；
B.var n = $（“：input， ：checked”）.length；
C.var n = $（“input：selected”）.length；
D.var n = $（“：input， ：selected”）.length；
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