Reducing power from H2O to H2Te

Down the group in the hydrides of 15th , 16th , 17th groupsA) Affinity towards Hydrogen decreasesB) X-H bond enthalpy decreasesC) X-H bond length increasesD) Thermal stability decreasesE) Acidic strength (Ka) increasesF) Reducing power increasesorder of reducing power isH2O< H2S < H2Se < H2Te