He harboured a feeling of malice towards his younger brother.

Answer: Option D

Malice : the desire to harm someone; ill will.
Love : an intense feeling of deep affection.
Rancour : bitterness or resentfulness, especially when long standing.
Spite : a desire to hurt, annoy, or offend someone.
Goodwill : friendly, helpful, or cooperative feelings or attitude.

Antonym of Malice is Goodwill