What Is the Work (Per Mole of Water) Associated with the Chemical

What is the work (per mole of water) associated with the chemical process in which hydrogen and oxygen gases combine to form liquid water at 25 ^oC?
( $\Delta$ H_rxn = $\Delta$ H_products - $\Delta$ H_reactants; $\Delta$ H_rxn = Bond broken - Bonds made)

A) +3.7 kJ/mol
B) -3.7 kJ/mol
C) +1.2 kJ/mol
D) -1.2 kJ/mol
E) 7.4 kJ/mol