A. Conduct which would otherwise constitute an offense is justified if a reasonable person would believe that he was compelled to engage in the proscribed conduct by the threat or use of immediate physical force against his person or the person of another which resulted or could result in serious physical injury which a reasonable person in the situation would not have resisted.B. The defense provided by subsection A is unavailable if the person intentionally, knowingly or recklessly placed himself in a situation in which it was probable that he would be subjected to duress.C. The defense provided by subsection A is unavailable for offenses involving homicide or serious physical injury.