The correct answer is A. pleasure.
Pleasure is a feeling of enjoyment or satisfaction. It is the opposite of pain or suffering.
Bliss is a state of perfect happiness or contentment. It is a state of being free from pain or suffering.
Ecstasy is a state of intense happiness or excitement. It is a state of being overwhelmed with joy or pleasure.
Fear is a feeling of anxiety or dread. It is a feeling of being afraid or worried about something.
Pleasure is the most opposite of agony because it is a feeling of enjoyment or satisfaction, while agony is a feeling of pain or suffering.