Answer:
A
Explanation:
Oxygen always has a -2 oxidation state, sodium always has a +1 Oxidation state
A: 2(S) + 4(-2) = -2 (overall charge)
2S -8 = -2
2S = 6
S = +3
B: S + -6 = 0 (overall charge)
S = +6
C: 2(+1) + S + 4(-2) = 0 (overall charge)
2 + S - 8 = 0
S - 6 = 0
S = 6
D: S + 4(-2) = -2 (overall charge)
S - 8 = -2
S = 6
