Read the following context and choose the best option to answer the question.
Context: Well Preston turned two on Aug 29th . He did n't really get what was going on with the birthday celebrations but had fun anyway . We had cake and ice cream and of course presents up at my mom 's . Which was lots of fun because both my grandmothers and most of my siblings came .
Question: Why did Preston not understand the birthday celebrations ?
Options: 
A. None of the above choices .
B. Preston was unsure of how to celebrate .
C. This was the first birthday Preston had ever celebrated .
D. Preston was too young to know what was happening .


D