The correct answer is option 4: the difference between high and low tide.

Tidal range refers to the vertical distance between the high tide and low tide marks in a given location. This measurement represents the difference in water level or the range of water movement between these two points during tidal cycles.

Option 1 is incorrect as it only describes the movement of sea water toward the coast. It does not specifically mention the tidal range.

Option 2 is also incorrect as it refers to the movement of sea water toward the sea, rather than mentioning the tidal range.

Option 3 is partially correct as it mentions the rise and fall of sea water, but it does not mention the tidal range specifically. Tidal range encompasses the rise and fall due to gravitational forces, but this option does not provide a complete definition.

Therefore, option 4 is the most appropriate answer as it specifically mentions the concept of tidal range, which is the difference between high and low tide.