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Which of the following is a complex sentence?
A.Sasha wrapped the present neatly and tied a blue ribbon around it.
B.Jack forgot to do his homework, so he rushed to finish it in the morning.
C.Kyle tried to eat his breakfast quickly because he was running very late.
D.Abby wanted to ride her bicycle, but she could not bike in the rain.
What is C.Kyle tried to eat his breakfast quickly because he was running very late.