单选题：列表推导
对列表a = [1, 2, 3 ,4 ,5, 6, 7, 8, 9, 10]进行以下哪个语句推导，even_square列表的值不一定是[4, 16, 36, 64, 100]。
A.even_square = [x**2 for x in a if x %2 ==0]
B.even_square = list({x: x**2 for x in a if x %2 ==0}.values())
C.even_square = list({x**2 for x in a if x %2 ==0})
D.even_square = list(x**2 for x in a if x %2 ==0)
答案：C
A.even_square = [x**2 for x in a if x %2 ==0]
B.even_square = list({x: x**2 for x in a if x %2 ==0}.values())
C.even_square = list({x**2 for x in a if x %2 ==0})
D.even_square = list(x**2 for x in a if x %2 ==0)
答案：C
