The correct answer is C. Acrimony.
Acrimony is a feeling of deep ill-will or resentment. It is often associated with anger, bitterness, and hostility. Acrimony can be expressed in words or actions, and it can have a negative impact on relationships.
Sourness is a sour taste or flavor. It is often associated with citrus fruits, such as lemons and limes. Sourness can also be caused by certain foods, such as vinegar and yogurt.
Hoarseness is a condition in which the voice is rough or husky. It is often caused by a cold, laryngitis, or overuse of the voice.
Aspersion is a false statement that is damaging to someone’s reputation. It is often used in the context of slander or libel.
None of these options are synonyms for bitterness.