His friends advised him to be fair and square in his dealings. A. Careful B. Considerate C. Polite D. Upright

The correct answer is D. Upright.

To be fair and square means to be honest and just. It means to treat others fairly and to be honest in your dealings with them. It also means to be impartial and to avoid favoritism.

The other options are not as accurate descriptions of what it means to be fair and square.

• Careful: To be careful means to be cautious and to avoid taking risks. It does not necessarily mean to be honest or just.
• Considerate: To be considerate means to be thoughtful of others and to take their feelings into account. It does not necessarily mean to be honest or just.
• Polite: To be polite means to be respectful and to use good manners. It does not necessarily mean to be honest or just.