28. The best explanation for the titration results represented by the following graph is Hd 14 13 12 10 9 8 7 6 5 4 3 2 1 0 0 Titration Curve for Titration of 37 mL of 0.10 mol/L H3PO4(aq) with NaOH(aq) 10 20 30 40 50 60 Volume of 0.10 mol/L NaOH(aq) (mL) 70 The acid can accept more than one proton O The acid can donate more than one proton The base can accept more than one proton O The base can donate more than one proton II 80 90 100