The C172RG has an odd configuration in that it requires hydraulic pressure in both directions. In simpler terms, to raise the gear, you need hydraulic pressure, and to lower the gear, you need hydraulic pressure. Any time the aircraft gets low on hydraulic fluid, you are basically out of luck. The gear is stuck where it remains. All the hand pump does is apply hydraulic pressure in the "downward" direction, so a loss of hydraulic pressure means a gear up landing.
I have no idea about question A, but come on, it's obviously a joke.
Cessna singles have notoriously bad gear systems due to the fact that they have to retract back into the fuselage, thus having a very odd retraction pattern, and the associated mechanical difficulties.
Additionally, the gear motor is VERY prone to overheating. If you are doing pattern work on a nice sunny day, you are better off to leave the gear down every other pattern rather than to overstress the gear motor.
The Cutlass is typically an underrated aircraft, and I encourage you to look at my previous thread regarding it to learn more about it.