The correct options are
A Minimum polarization is brought about by a cation of low radius.
B A large cation is likely to bring about a large degree of polarization.
D A small anion is likely to undergo a large degree of polarization.
A) Maximum polarization is brought about by a cation of low radius. Hence, the option A is incorrect.
B) A large cation is likely to bring about a smaller degree of polarization. Thus, the option B is incorrect.
C) Maximum polarization is brought about by a cation of high charge.The option C is correct.
D) A large anion is likely to undergo a large degree of polarization. Hence, the option D is incorrect.