Explanation:

- Option 1: indignant

- Indignant means feeling or showing anger or annoyance at what is perceived as unfair treatment.

- He was angry because his brother refused to help him, which feels unfair.

- Option 2: indicted

- Indicted means formally accused or charged with a serious crime.

- This does not relate to feeling upset or annoyed.

- Option 3: enchanted

- Enchanted means delighted or charmed by someone or something.

- This is not relevant to feeling upset or annoyed because of help refusal.

- Option 4: enamoured

- Enamoured means charmed by or in love with someone or something.

- This is not relevant to being upset about help refusal.

- Correct Answer: Option 1: indignant