Correct Answer:
A. Honest
The correct answer is "Honest". The idiom 'Fair and Square' means to do something in a completely honest, straightforward, and legitimate manner, without any cheating or deception. It emphasizes integrity and adherence to rules.
- "Business-like" implies efficiency and professionalism, which is not the core meaning of the idiom.
- "Active" refers to being engaged or in motion, unrelated to the idiom's sense of integrity.
- "Authoritative" means reliable or commanding, which does not capture the essence of fairness and honesty.