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If the arithmetic mean of 0, 5, 4, 3 ...

If the arithmetic mean of 0, 5, 4, 3 is `a` , that of `-1,\ 0,\ 1,\ 5,\ 4,\ 3` is `b` and that of 5, 4, 3 is `c` , then the relation between `a ,\ b` and `c` is `a=b=c` (b) `a : b : c=3:2:4` (c) `4a=5b=c` (d) `a+b+c=12`

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