Explanation:

- Atomic radii generally increase as you move down a group and decrease as you move across a period from left to right.

- Beryllium (Be): Located in period 2, group 2. It has a smaller atomic radius compared to lithium.

- Lithium (Li): Found in period 2, group 1. It has a larger atomic radius than beryllium, nitrogen, and carbon due to its position as an alkali metal.

- Nitrogen (N): Located in period 2, group 15. It has a smaller atomic radius compared to lithium and carbon.

- Carbon (C): Found in period 2, group 14. It has a smaller atomic radius than lithium but larger than nitrogen.

Correct Answer: Option 2 - Lithium