Chemistry question about arrhenius acids!

Which two formulas represent Arrhenius acids?

A. CH3COOH and CH3CH2OH
B. HC2H3O2 and H3PO4
C. KHCO3 and KHSO4
D. NaSCN and Na2S2O3


How can you tell which ones give off H+ ions?

B. HC2H3O2 and H3PO4
acetic acid releases H+
& phosphoric acid releases H+