Yes, the rear compartment of a vehicle (CHOICE C) is an excellent choice! This location is cooler and cleaner than the other choices, and you want to make sure the food doesn’t enter the Temperature Danger Zone. If your rear vehicle compartment is not too clean, you can always place the donation container on a clean sheet to minimize the risks of cross-contamination. Choice A (with the cat) is not a good choice due to the risks of contamination from pet hair, and Choice B (floorboard) is not a good choice because of the potential exposure to heat from floor heater vents.