Answer
Oxygen>Sulfur>Hydrogen
Work Step by Step
Right away I notice that hydrogen is much lighter per mole than anything else, therefore it goes as the lowest percentage. Next, I see that there are four times the amount of oxygen per mole compared to sulfur. With sulfur having a molar mass at 32g/mol and oxygen having a molar mass of 16g/mol, oxygen will have twice the mass percentage of sulfur.
