Topic: Idioms & Phrases,

Best Answer Explained in Below-:

The phrase "His honour is now at stake" is a common expression that signifies that a person's reputation or integrity is in jeopardy or at risk. In this context, "at stake" implies that there are significant consequences or potential losses involved, particularly pertaining to one’s honor or dignity.

When we analyze the other options:

- **A) home** does not convey any meaningful relation to honor; it is more about physical location and lacks the implication of risk or consequence.
- **B) large** is an adjective that does not fit contextually, as it cannot describe the state of honor in this idiomatic phrase.
- **C) danger** implies a threat but doesn't directly tie to the personal concept of honor. While one can have their life at danger, it does not specifically address the notion of maintaining or losing honor.

Thus, "at stake" is the most appropriate choice because it directly conveys the critical nature of preserving one's honor, making it the correct answer to the question. This phrase resonates within contexts of competition, conflict, or situations demanding integrity, emphasizing the weight of maintaining reputation.