Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution ?

0.4 mole of NH3 with 0.2 mole of HCI

0.0002M HCI

0.2 mole of NaCI with 0.2 mole of HNO3

0.4 mole of CH3COOH with 0.4 mole of NaOH