Commercially,methanol is prepared by:

• A
  Reduction of $CO$ in the presence of $ZnO-Cr_2O_3$
• B
  Methane reacting with water vapours at $900 \ ^\circ C$ in the presence of $Ni$ catalyst
• C
  Reduction of $HCHO$ by $LiAlH_4$
• D
  Reduction of $HCHO$ by aqueous $NaOH$