Which of the following sentences illustrates proper sentence structure?

Which of the following sentences illustrates proper sentence structure?

A. Walking down the street, my eyes were drawn to a diamond in a store window.
B. A small red car pulled up behind the woman with tinted windows.
C. The man in the black cape mounted his powerful stallion and rode away.
D. The cats chased the birds around the yard with the yellow beaks.

Answer - C