小明的学习小组需要整理数学考试成绩，将高于等于80分的记录标记为"A"，60-79分标记为"B"，其余标记为"C"。已知成绩列表为 scores = [75, 92, 58, 84, 65]，以下哪种推导式能正确生成等级列表？ （ ）
["A" for x in scores if x >=80] + ["B" for x in scores if 60<=x<80] + ["C" for x in scores if x<60]
["A" if x >= 80 else "B" if x >= 60 else "C" for x in scores]
[x >=80 ? "A" : x >=60 ? "B" : "C" for x in scores]
{ "A" if x >=80 else "B" if x >=60 else "C" for x in scores }