On an island there are red, green and blue chameleons. Whenever two chameleons of different colours meet, both change to the third colour; nothing else changes a chameleon's colour. Which of the following states can be reached?
AAll red.
BAll green.
CAll blue.
D of each colour.
E red, green and blue.
FAny one of “all red”, “all green” and “all blue”.
G“All green”, but neither of the other two single-colour states.
HNone of the states listed above.