Fill in the blank (_) in the following sentence from the following choices.
Sentence: There was more iron in the meteorite than in the rock because the _ was larger.

Choice 1: There was more iron in the meteorite than in the rock because the meteorite was larger.
Choice 2: There was more iron in the meteorite than in the rock because the rock was larger.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.