Phillip Is an Undercover Peace Officer Assigned to Look for Pickpockets

Phillip is an undercover peace officer assigned to look for pickpockets at the county fair.He observes Frank deftly lift Sheila's wallet from her open purse.Phillip approaches Frank and identifies himself as an officer.At that moment Frank shoves Phillip down and takes off running.Phillip,unhurt,leaps to his feet and gives chase.He tackles Frank and places him under arrest.A search of Frank reveals Sheila's wallet and a .32 pistol in his jacket pocket.Frank has committed:

A) aggravated robbery because he assaulted a peace officer while committing a theft.
B) robbery because he committed an assault in the immediate flight from a theft.
C) aggravated robbery because he was in possession of a deadly weapon while committing a felony theft.
D) theft,not robbery,because the element of assault with bodily injury is missing.