Well you all had the right issues: General Intent crimes v. Specific intent crimes coupled with mistake of fact and mistake of law.
General Intent Crime: Battery
Specific Intent Crime: Assault (which is what cat is charged with here)
The Mens Rea in General Intent Crimes (Involuntary Manslaughter, Battery, etc) can only be negated by reasonable
mistakes of fact, thus the Prosecutor is right about the Battery charge and the Battery charge only.
The Mens Reas in Specific Intent Crimes can be negated by either reasonable or
unreasonable mistakes of fact, thus the Defendant is right about applying this standard to the Assault charge but not to the Battery charge. Un
reasonable mistakes of fact won't get him off for battery.
Therefore, the answer combining the two correct answers is A.
Maybe it's just me, but that's a lot to think about in 1.8 minutes.