What was the reason behind Greg Rucka's attempted killing of Joe Quesada in the CSI: Crime Scene Investigation comic book mini-series Dying in the Gutters?

A. Because of his perceived role in the cancellation of Gotham Central
B. Due to a misunderstanding on a comic book storyline
C. Over a dispute on comic book art style
D. As a result of a rivalry between comic book publishers
Answer: 