Fill in the blank (_) in the following sentence from the following choices.
Sentence: Craig took his car to Neil to have the front axle repaired since _ knew he was a mechanic.

Choice 1: Craig took his car to Neil to have the front axle repaired since Craig knew he was a mechanic.
Choice 2: Craig took his car to Neil to have the front axle repaired since Neil knew he was a mechanic.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2.