Consider the outline of glycolysis Which steps include a sub

Consider the outline of glycolysis. Which steps include a substrate-level phosphorylation? (Shown Below)
A.) a and c B.) a, c, g and h C.) f and i D.) a, c, f and i

There are below two steps in glycolysis where ATP is synthesized without involvement of electron transport chain (ETC):

Therefore, the correct option is: C)f and i