Lee's ablest lieutenant, who was accidentally shot by a Confederate sentry and died of a blood clot at the Battle of Chancellorsville. This lieutenant's untimely death during a pivotal moment in the war:
a) Dealt a significant blow to Confederate morale and military effectiveness
b) Demonstrated the dangers of friendly fire incidents in combat
c) Raised questions about the leadership and discipline within the Confederate ranks
d) Highlighted the unpredictability and brutality of Civil War combat