Read the following context and choose the best option to answer the question.
Context: " Uh-- " His foot catches , his ankle hyperflexed and twinging , and he tips sideways , arms windmilling in empty air as he lurches into the bookcase . " Ow ! " Shelves press hard dents into his arm , Don snickers infuriatingly , and Charlie grumble as he steadies himself . " Ow , dammit .
Question: What is being described in the scene ?
Options: 
A. None of the above choices .
B. Don hurting himself .
C. Charlie hurting himself .
D. Don falling into something .


C