The correct answer is B. rancour.
Rancour is a feeling of deep-seated ill will or resentment. It is often associated with hatred or bitterness. In the context of the question, the speaker is harbouring a feeling of rancour towards his younger brother. This suggests that
the speaker feels a deep-seated resentment towards his brother, and that this resentment is likely to be long-lasting.The other options are not as accurate descriptions of the speaker’s feelings. Love is a positive emotion, while rancour is a negative emotion. Spite is a feeling of malicious pleasure derived from another person’s misfortune, while rancour is a more general feeling of ill will. Goodwill is a feeling of good will or benevolence, while rancour is a feeling of ill will or resentment.
In conclusion, the correct answer to the question is B. rancour.