Answer
Please see the work below.
Work Step by Step
We can arrange the given species in order of increasing oxidation number of the Sulfur atom as follows
a. $H_2S$
b. $S^{-2}$
c. $HS^-$
d. $S_8$
e. $SO_2$
f. $SO_3$
g. $H_2SO_4$
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