In softball, the distance from the pitching mound to the batter is typically 43 feet in fast-pitch softball. However, based on the choices you've provided, if you are referring to the distance for a "slow-pitch" format, it is generally 50 feet, but that's not listed.
From the options given:
- 66 feet
- 35 feet
- 25 feet
- 40 feet
None of these options are correct for either fast-pitch or slow-pitch distances. If you had to choose the closest option given, 40 feet could be used in some modified formats or for younger age groups in some leagues, but it is not the standard distance for adult softball leagues.