Answer:
If our team is bigger, stronger, and tougher, we will win the game. This sentence is the best form of the given sentence in subjunctive mood.
Option: B
When a verb is written in subjunctive mood, the sentence expresses imaginary situation. The writer is not sure about the information provided in the sentence and thus tries to create a made-up incidence, where his team is very strong.
These sentences generally begin with the word if to express the lack of surety in the sentence. Here, the writer thinks that is his team will be tougher (an imaginary situation), then he will win the game (the result of the imagination).