The correct option is C praise
The word 'disparage' refers to regarding as being of little worth.
Option A, denigrate refers to criticising unfairly.
Option B, belittle refers to dismissing as unimportant.
Option C, praise refers to expressing warm approval and admiration of.
Option D, please refers to causing to feel happy and satisfied.
Thus, according to the meaning, the word 'praise' is the opposite of the word 'disparage'.