My pick is A.

But working on different examples may be might prove C.

Option B alone cannot win because,

Evenly spaced sets vary in Standard deviation if the difference between the numbers in the set varies.

Ex: set A: { 2 4 6 8 10 }

set B: { 1 2 3 4 5 }

Both are evenly spaced sets but here SD of A increases.

But some where i have learnt that SD of a set with larger range is always bigger than the other.

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D- Day December 30 2011. Hoping for the happiest new year celebrations !

Aiming for 700+

Kudo me if the post is worth it