A.I. Explanation:

Option 1: "they are going to land on a farm."

Explanation: The text discusses the likelihood of aliens meeting a farmer upon arriving on Earth, which aligns with the idea of landing on a farm. The phrase '4 out of 10 times' indicates a probability that supports this interpretation, making it the most logical completion of the sentence.

Option 2: "they are going to stay on a farm."

Explanation: This option suggests permanence ('stay') rather than the initial action of arriving ('land'). The text does not imply that aliens would remain on a farm, making this option inconsistent with the context.

Option 3: "they are going to play on a farm."

Explanation: While 'play' is a possible activity, it does not relate to the main idea of the text, which focuses on the likelihood of aliens meeting a farmer. This option introduces an unrelated action that does not fit the context.

Option 4: "they are going to work on a farm."

Explanation: This option implies an action that suggests labor ('work'), which is not supported by the text. The focus is on the encounter with a farmer, not on the aliens engaging in work, making this option irrelevant.