BITTERNESS :

Answer: Option C

Sourness :having an acid taste like lemon or vinegar.
Hoarseness :sounding rough and harsh, typically as the result of a sore throat or of shouting.
Aspersion :an attack on the reputation or integrity of someone or something.
Acrimony :bitterness or ill feeling.
Bitterness :sharpness of taste, lack of sweetness.

Synonym of Bitterness is Acrimony.