Explanation:

Let’s break it down:

- Area of square field = X m²

- Cylindrical ditch volume = p × (7)² × 2 = 22/7 × 49 × 2 = 308 m³

- This earth is spread over the remaining area of the field (X - base area of ditch), raising it by 0.77 m

- Volume of earth covering = (X - p × 7²) × 0.77

- Set equal to earth removed: (X - 154) × 0.77 = 308

- X - 154 = 308 / 0.77 = 400

- X = 400 + 154 = 554 m²

Correct Option:

- Option 4: 554 m²