Can you answer this riddle (10 points!)? it's really a good one, i don't know

Homemaker

New member
the answer.? ok there are 4 thieves captured by a king, waiting to be hanged. but the king gives them a riddle (or rather challenge?) and if at least one of them can answer it correctly, all 4 of them will be released.
thief A was made to stand on a table. B on a stool, in front of A. C in front of B, standing on the floor. D in front of C, in a dark room. so it's A, B, C and D all standing in a straight line, A can see B and C. B can see C only. C cant see any of them. D too cant see any of them and no one can see D either. 2 red apples and 2 green apples were brought in, each was put on each of their heads but they dont know what colour apple was put on their head. they cant move an inch, they're not allowed to communicate with each other.
even if one of them can correctly tell what colour apple is on his head, all 4 of them will be released.
they were released. who gave the right answer and how?
 
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