Thing getting reduced/oxidized = element
Reducing agent = molecule
If this is the reaction, we know that H is getting reduced (+1 to 0) and Fe is getting oxidized (0 to +2).
H = reduced
Fe = oxidized
But oxidizing/reducing agents are molecules (reactants).. so since the reducing agent is the thing that gets oxidized.. it's Fe. The oxidizing agent would be H2SO4 (not just H).