A student determines the rate constant for the reaction of iodide with hydrogen peroxide in strongly — Kinetics Chemistry Question

A student determines the rate constant for the reaction of iodide with hydrogen peroxide in strongly acidic solution (Rate = k[H₂O₂][I–][H⁺]) by mixing 1.00 mL aliquots of solutions of known concentrations of potassium iodide, ascorbic acid, and hydrochloric acid with four drops of starch solution, then adding 1.00 mL of hydrogen peroxide solution and recording the time required for the solution to turn blue. A student uses half the stipulated amount of one of the solutions but does not realize it. Underdosing of which solutions will cause the value of the rate constant to be too high?
I. Hydrochloric acid
II. Ascorbic acid