I suspect that pavon/peacock/ocellaris are all references to the prominent eyespot on the caudal peduncle of this fish. My devious mind concentrated on the 'pea' - I needed a way to insert another fish, particularlry a rather confusing one.
The photo for C was taken at Chester and the animals there are labelled as Cuora galbinifrons, Paignton also has the same species I think they are labelled as Vietnamese box turtles. Bristol has Cuora bourreti, which was thought to be a subspecies, but is now considered a full species, although they look very similar. This is the Central Vietnamese flowerback box turtle that @lintworm named. I do not know how to tell the difference and I didn't think it mattered for the quiz because the important word was 'box', so either answer works (as does 'flower' of course). Other box turtles are available of course
The photo for C was taken at Chester and the animals there are labelled as Cuora galbinifrons, Paignton also has the same species I think they are labelled as Vietnamese box turtles. Bristol has Cuora bourreti, which was thought to be a subspecies, but is now considered a full species, although they look very similar. This is the Central Vietnamese flowerback box turtle that @lintworm named. I do not know how to tell the difference and I didn't think it mattered for the quiz because the important word was 'box', so either answer works (as does 'flower' of course). Other box turtles are available of course