If the mean of $a, b, c$ is $M$ and $a b+b c+c a=0,$ then the mean of $a^{2}, b^{2}, c^{2}$ is
If the mean of $a, b, c$ is $M$ and $a b+b c+c a=0,$ then the mean of $a^{2}, b^{2}, c^{2}$ is
- A
$M ^{2}$
- B
$3 M ^{2}$
- C
$6 M ^{2}$
- D
$9 M ^{2}$
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