Read the following context and choose the best option to answer the question.
Context: Feeling much better but it took me a good portion of the day to recover . I think I may have been dehydrated and combined with exhaustion and different food I hit the wall . I think Richie may have hit a wall last night too . After the welcoming party at the gallery , which included dignataries and many local artists , plus a young guy from Canberra studying sculpture in Kyoto .
Question: Why did the narrator need time to recover ?
Options: 
A. None of the above choices .
B. They had had an injury .
C. They had had a busy day .
D. They had had car accident .


C