Answer:
1 - on Wednesdays
Step-by-step explanation:
When expressing the time or day of the week on which an activity takes place, the preposition "on" is used.
In this case, "He plays soccer" is followed by "on Wednesdays" to indicate that the activity (playing soccer) occurs specifically on the day "Wednesdays."
The correct usage is "on" to indicate a specific day of the week.
Hope this helps!!!