Oxygen is more electronegative than sulphur,yet $H_2S$ is acidic in nature while $H_2O$ is neutral. This is because:

• A
  $H_2S$ molecules are associated due to inter-molecular $H$-bonding
• B
  $H_2O$ has a higher boiling point than $H_2S$
• C
  $H-S$ bond is weaker than $O-H$ bond
• D
  $H_2S$ is a gas at ordinary temperature while $H_2O$ is a liquid