The correctly structured sentence using semicolons should follow this structure. Based on your sentences, it seems that they need some adjustments, as none of the original sentences use semicolons correctly. However, let's clarify the use of semicolons.
Semicolons are typically used to connect independent clauses that are closely related in thought or to separate items in a list that already includes commas.
Here’s a corrected version of one of your sentences using a semicolon:
"We have to finish our homework; otherwise, we may not be able to go to softball practice."
If you're still looking to choose from the provided sentences, I suggest rephrasing them with the correct use of semicolons.