请选择ABC1E3i2X*~0F3}/q.J9e(p8p3_4L(d:\The books are nice. How much _______?,s1p2F-m,\.R+`9\7u
A. is it,s1p2F-m,\.R+`9\7u
B. are they,s1p2F-m,\.R+`9\7u
C. they are,s1p2F-m,\.R+`9\7u