哪句才對?謝謝!!!!!

答案當然是C(a pair of blue jeans)，但若答案A沒有冠詞a，也是對
像剪刀(scissors)，褲子(trousers)，眼鏡(glasses)等，由兩邊合而為一組成的東西用複數形，或用(a pair of...)來形容。
既然blue jeans是複數形名詞，故不能用a blue jeans；所以就只有C才對。

有一點你還提的，這些東西若用a pair of...動詞要用單數形，否則要用複數形，如：
My glasses were broken.
My pair of glasses was broken.
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答案應該係 "C" - She wears a pair of blue jeans

你會發現褲子嘅英文後面都係有 "s" ......起英文文法入面...."Jeans" , " Shorts" , "pants" and "Trousers" 都係 plural....你可以想象一下....因為褲子係由兩隻褲腳組成....所以係 plural....如果你講 "pant","trouser" or "jean" ....英文j字典裡面係無E d 字o架!!!!! 緊記!!!

for A and B - She wears a blue jeans and She wears pair of blue jeans
都係錯o架!!!!
但係你可以講 " She is wearing pants/trousers/jeans/shorts"
點解??? 因為當你唔用 "a" or " a pair of"......你就可以就咁用 pants/trousers/jeans/shorts.....
但係如果你用 "a" ....就一定要用 " a pair of"....如果你用 "pair of" ...就一定要加 "a"......文法定咗...係無得改 ga!!!

C. She wears a pair of blue jeans.


褲 TROUSERS, PANTS, SHORTS and 剪刀 SCISSORS is always ( a pair of .... )

that is why 牛仔褲 is called JEANS and not JEAN.