In the following question, out of the given four alternatives, select the one which is opposite in meaning of the given word.
Chaste

Chaste means pure, virginal, morally clean, or uncorrupted.
Corrupt means having or showing a willingness to act dishonestly in return for money or personal gain, or morally depraved. This is the opposite of chaste.

Proper, Neat, and Controlled align more closely with characteristics of being disciplined or pure.

Therefore, the correct option is C.