One Night, Alvin Entered a Convenience Store Intending to Rob

One night, Alvin entered a convenience store intending to rob it. When he entered, he shoved a gun in the store clerk's face and demanded money. Unbeknownst to Alvin, the store clerk had a loaded gun under the cash register. At a moment when Alvin was distracted and looking out the window, the store clerk pulled the weapon and fired a gunshot in an attempt to scare Alvin. Unfortunately, the gunshot hit one of the customers in the store. Which of the following is true?

A) Alvin is likely guilty of the customer's death under the agency theory of felony murder.
B) Alvin is likely guilty of depraved heart murder.
C) Alvin is likely guilty of voluntary manslaughter.
D) Alvin is likely guilty under the proximate cause theory of felony murder.