The president of the party deprecated the move of the Government to introduce electoral reforms in a haste.

The other options are incorrect because they do not accurately reflect the meaning of the word “deprecate.” To welcome something is to express pleasure or satisfaction at its occurrence. To deny something is to state that it is not true. To humiliate someone is to make them feel ashamed or embarrassed.

In conclusion, the correct answer is C. protested. The president of the party is expressing disapproval of the government’s move to introduce electoral reforms in a haste.