Explanation:

- Flint stone: Flint stones were among the earliest tools used by humans, mainly for cutting and scraping. While crucial for survival, they did not directly cause the shift to agriculture.

- Catapult: This is a device for hurling stones, mainly used in warfare, and is not related to the development of agriculture.

- Hand axe: An early multipurpose tool, used for cutting wood and hunting, but not specifically for farming or starting settled life.

- Hoe : The hoe is an agricultural implement used for tilling soil. It allowed early humans to prepare land for planting crops, making settled farming possible and leading to the "silent revolution" from a nomadic lifestyle to an agricultural society.