Fill in the blank (_) in the following sentence from the following choices.
Sentence: Donald asked Justin to help with writing the paper since _ was skilled at writing.

Choice 1: Donald asked Justin to help with writing the paper since Donald was skilled at writing.
Choice 2: Donald asked Justin to help with writing the paper since Justin was skilled at writing.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.