Select the option that can be used as a one-word substitute for the given group of words.

Something that is to your advantage but happened by chance

Fortuitous

The word that can be used as a one-word substitute for "something that is to your advantage but happened by chance" is fortuitous.

• Fortuitous means happening by chance in a happy or beneficial way.
• Purposeful means having a purpose or intention.
• Deliberate means done intentionally or with careful thought.
• Occidental means relating to or characteristic of the western world.

Fortuitous is the most appropriate word for the given group of words because it specifically refers to something that happens by chance but is beneficial to the person it happens to. It is derived from the Latin word fortuitus, meaning "by chance."