Answer:
Thixotropic refers to a gel/substance that is thick and stable but will start to move or flow like a fluid when stress is applied (being shaken, stirred, placed under pressure, etc.). This is important to keep in mind when building houses as landslides or other disruptions and movements in the ground can happen during an earthquake with thixotropic clay in the soil, causing the buildings there to collapse or otherwise be damaged.
In The Red Badge of Courage, when Henry wakes up in camp the day after fighting, he first think he is in a Charnel place because the sleeping men around him look dead.
I think the answer would be C, because an implicit theme is one that's hidden in the story and you kind of have to dig into the piece and look for it.