Fill in the blank (_) in the following sentence from the following choices.
Sentence: The veterinarian tried to use the chemicals to kill the lice but the _ were too weak.

Choice 1: The veterinarian tried to use the chemicals to kill the lice but the lice were too weak.
Choice 2: The veterinarian tried to use the chemicals to kill the lice but the chemicals were too weak.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2. The sentence should read "The veterinarian tried to use the chemicals to kill the lice but the chemicals were too weak." The