Fill in the blank (_) in the following sentence from the following choices.
Sentence: I was building a treehouse in my backyard but had to start over because the door was higher than the walls. I guess I made the _ too tall.

Choice 1: I was building a treehouse in my backyard but had to start over because the door was higher than the walls. I guess I made the door too tall.
Choice 2: I was building a treehouse in my backyard but had to start over because the door was higher than the walls. I guess I made the walls too tall.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.