Read the following context and choose the best option to answer the question.
Context: we all forgot my dad 's birthday on the 20th ! O : he even forgot too . LOL . well my sister and i remembered yesterday night so we took my dad out to eat souplantation .
Question: Why would the narrator 's father be angry at her ?
Options: 
- The narrator forgot to bring his car back .
 - The narrator forgot his birthday .
 - The narrator forgot to reimburse him for a loan .
 - The narrator forgot his money .


The narrator forgot his birthday .