Fill in the blank (_) in the following sentence from the following choices.
Sentence: Justin felt a lot of stress while taking care of Brett, because _ really cared about their friend's health.

Choice 1: Justin felt a lot of stress while taking care of Brett, because Justin really cared about their friend's health.
Choice 2: Justin felt a lot of stress while taking care of Brett, because Brett really cared about their friend's health.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
2. The sentence should read "Justin felt a lot of stress while taking care of Brett, because Brett really cared about their friend