Read the following context and choose the best option to answer the question.
Context: i was wrong . i got the dates mixed up again . i was on my way to writing the damn commemorative post when i checked the dates and saw that it was n't today but next week ... well , at least today has been good so far .
Question: Why has getting the dates messed up upset the speaker to this extent ?
Options: 
A. They rented a car specifically to drive to the event and ca n't afford to rent another one
B. None of the above choices .
C. This was the only weekend they could get off of work and wo n't have the time next week
D. They spent a lot of energy preparing for the wrong event


D