Explanation:

- Option 1: Express offer

- An express offer is a clear and definite proposal made verbally or in writing.

- Posting a car for sale on the internet clearly demonstrates intention to sell.

- This is the correct option.

- Option 2: Implied offer

- An offer inferred from actions rather than words.

- Selling a car online doesn’t involve any implied actions.

- Option 3: Particular offer

- An offer made to a specific person or group.

- Selling a car online is to the general public, not to specific individuals.

- Option 4: No offer

- Suggests there is no proposal to sell.

- Listing a car online clearly indicates an intention to sell.