Explanation:

- Option 1: exetension

- This is not the correct spelling. The right word should be "extension."

- An extension is something that is added on to something else, such as an added time period or a supplementary building part.

- Option 2: executive

- "Executive" is correctly spelled.

- It refers to a person with senior managerial responsibility in an organization. It also relates to the execution of laws and policies.

- Option 3: excursion

- "Excursion" is correctly spelled.

- It means a short journey or trip, often for leisure or educational purposes.

- Option 4: execution

- "Execution" is correctly spelled.

- This refers to the act of carrying out a plan, order, or course of action.

Correct Answer: Option 1 - exetension