Which sentence best states the central idea of "The Vain Jackdaw"?
A.The jackdaw almost becomes king, but the other birds ruin it for him.
B.The other birds become envious when they see the jackdaw's beauty.
C.The jackdaw cannot win by passing off the other birds' feathers as his own.
D.The jackdaw has no chance of winning the contest because he is unattractive.