Explanation:

The original sentence is incorrect.

Reason: When the sentence contains two actions, both of them should not be in the future tense. The action which takes place first should be in the simple present tense. In the given sentence, the first action is getting the green signal and the second action is starting the race. Therefore, ‘will’ should be omitted so as to make the sentence correct.

Among the given choices option B replaces the bold part most appropriately.

The sentence after replacement becomes:

We will start the game when we get a green signal from our technical team.

Option B is hence the correct answer.