He was nervous but tried to keep his chin up during the interview.What does the underlined idiom mean?

Explanation

The correct answer is Option B: 'To remain cheerful in difficulty'. The idiom 'keep his chin up' implies that despite feeling nervous, the individual is trying to maintain a positive outlook during the interview. It reflects resilience and optimism in challenging situations.Options A, C, and D are incorrect because they do not align with the context of the sentence. Option A ('To be proud') suggests a sense of self-importance, option C ('To be arrogant') implies superiority, and option D ('To act carelessly') conveys a lack of caution, none of which relate to managing feelings of nervousness.