Brad,
A. is the stack I recommend for you. The 100km plan fits nicely to do first and prep you for Growler. Your longest training ride needs to be as long as your race only if you are on a Finisher plan with a goal to finish. If you are on a PR plan with a goal to improve your speed and set new best performances then quality and not quantity is your mission.
The 100 mile PR plan is the right plan for PCP2P. That is as hard or harder than most hundies.
Lynda