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Which one of the following metals will give blue ash when its salt is heated with `Na_2 O_3` solid and `Co(NO_3)_2` on a charcoal piece?

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Which one of the following metals will give blue ash when its salt is heated with `Na_2 O_3` solid and `Co(NO_3)_2` on a charcoal piece?
A. Cu
B. Mg
C. Al
D. Zn
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Due to the formation of `Al_(2)O_(3)Co O` (blue in colour) `Al^(3+)` will form blue mass of this test.
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