How Did the Cannon Affect the Power of Monarchies

How did the cannon affect the power of monarchies?

A) Only central governments could afford cannons, enhancing the military power of the central states over their nobility.
B) Because cannons were seen as a dishonorable form of battle, nobles generally vacated their military posts, leaving monarchies with largely unfettered power.
C) The flexibility of cannon permitted many nobles to obtain them, sparking a long period of internal civil war.
D) Cannons were easily copied, which diluted kings' military power since they had to spread troops across the realms in case of threat from other countries as well as their own nobility.