Fill in the blank (_) in the following sentence from the following choices.
Sentence: Dennis surprised Steven with a watermelon as a snack because _ knew he loved them.

Choice 1: Dennis surprised Steven with a watermelon as a snack because Dennis knew he loved them.
Choice 2: Dennis surprised Steven with a watermelon as a snack because Steven knew he loved them.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
2.