My sister is the biggest piece of shit . She texted me Saturday afternoon , roughly six hours before we were supposed to meet up for dinner with my dad , with , " I do n't think I can make it tonight , I ' m broke . " Bitch , we made these plans THREE WEEKS AGO and you could n't get your shit together enough to have TWENTY BUCKS to take your dad out to dinner ?
According to the above context, choose the best option to answer the following question.
Question: Why is she mad at her sister ?
Options:
A. She has too much free time .
B. None of the above choices .
C. She 's acting irresponsibly .
D. She paid for everything last time they went out .


C