Select the most appropriate meaning of the underlined idiom in the given sentence.

The apple of discord among the brothers was their father’s mansion in the country.

reason for quarrel

The most appropriate meaning of the underlined idiom in the given sentence is reason for quarrel. The idiom "apple of discord" means a cause of disagreement or conflict.

The other options are not as appropriate.

• Fruitful discussion means a discussion that is productive and leads to positive results.
• Hopeful attention means attention that is given with hope or expectation.
• Sincere affection means affection that is genuine and heartfelt.