Fill in the blank (_) in the following sentence from the following choices.
Sentence: Mary was not able to afford a boat, but Rebecca was, because _ made less money.

Choice 1: Mary was not able to afford a boat, but Rebecca was, because Mary made less money.
Choice 2: Mary was not able to afford a boat, but Rebecca was, because Rebecca made less money.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.