Select the most appropriate option to fill in the blank.

His father was killed in a ______, when the boy was nine years old.

duel

The most appropriate option to fill in the blank is duel.

• Dwell means to live or stay in a place for a long time.
• Drool means to let saliva run out of the mouth.
• Dual means having two parts or aspects.
• Duel means a formal fight between two people, usually with swords or pistols.