Opt (verb)

1. To make a choice or decision.
2. To choose to do something or to have something done.

Origin:

Early 19th century (as an adjective in the sense "optional"): from latin optare "choose".

Examples:

1. He opted to take the bus instead of the train.
2. She opted to have the surgery.
3. They opted for a more expensive option.
4. I will opt for a vegetarian meal.
5. He opted out of the project.