What provides maximum protection against skunking?

The option that provides maximum protection against skunking includes cans, ceramic bottles, and bottles in closed case boxes because each of these options effectively limits exposure to light, which is a key factor in the skunking process.

Cans are completely opaque, preventing any light from leading to the photochemical reactions that can create off-flavors, including skunky notes. Ceramic bottles also block light effectively, and while they may not be as common as cans, they are still superior to clear glass in terms of light protection. Bottles in closed case boxes benefit from added protection, as the box itself prevents light exposure and further insulation can keep the beer in optimal conditions.

In contrast, clear glass bottles provide little to no protection against light, which is why they're known to be particularly susceptible to skunking. While other types of packaging might reduce risk to some extent, the combination of all three options listed in the correct choice offers the best means of prevention against skunking, thus ensuring the integrity and taste of the beer are preserved.