The questions and answers had words like should, must, proper, wrong, right, consistent, which were a problem for me. But behind those considerations were the considerations of definitions of the abstract terms addressed, of what language itself is, and of whether, after working backward from what we think we know, we really know anything.
On a practical level, the ways people act and choose are influenced not just by ethical philosophy but by culture, family, genetics, education, religious upbringing, trace minerals in the diet or lack thereof, hormones, pheromones of those nearby, weather, parasites, whatever.
The quiz needed an answer choice of "don't know" and a philosophy of "I don't know . . . and I don't know if I don't know."