Which of the following statements are NOT correct? $\\$ A. Hydrogen is used to reduce heavy metal oxides to metals. $\\$ B. Heavy water is used to study reaction mechanism. $\\$ C. Hydrogen is used to make saturated fats from oils. $\\$ D. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any elements. $\\$ E. Hydrogen reduces oxides of metals that are more active than iron. $\\$ Choose the most appropriate answer from the options given below: