Identify the contour interval (metres) for large scale of map for rolling ground?

Correct option is A

Contour Interval Based on Ground Condition and Map Scale
Flat Ground: Contour interval of 0.2–0.5 m is used for a large-scale map.
Rolling Ground: Contour interval of 0.5–1.0 m is suitable for a large-scale map.
Hilly or Mountainous Ground: Contour interval of 2–5 m or more is adopted for a small-scale map.