Respuesta :
I believe the correct answer would be firefighters worked tirelessly to control the fire. In the sentence, you would see that the firefighters are doing the action of the verb which is worked. It is an indicator whether a sentence is in the active voice or the passive voice.
Answer: B. Firefighters worked tirelessly to control the fire.
Explanation: Active voice is used to describe a sentence where the subject performs the action that the verb states. The subject in this sentence is the firefighters and they are working tirelessly to control the fire.