Fill in the blank (_) in the following sentence from the following choices.
Sentence: Angela wanted to write a letter to her teacher but sent him a postcard instead because the _ would've been inappropriate.

Choice 1: Angela wanted to write a letter to her teacher but sent him a postcard instead because the letter would've been inappropriate.
Choice 2: Angela wanted to write a letter to her teacher but sent him a postcard instead because the postcard would've been inappropriate.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.