Explanation:

- In field hockey, the side-line length is defined by international standards.

- Field dimensions are typically 91.4 meters long and 55 meters wide.

- Option 1: 110.0 m - This length is longer than the standard side-line.

- Option 2: 72.3 m - This does not match the recognized field dimensions.

- Option 3: 91.4 m - This is the correct length for the side-line in a standard field hockey pitch.

- Option 4: 102.1 m - This length exceeds the standard dimension for a side-line.