Please answer all the questions for a thumbs up (I do not have anymore questions so please answer all, will thumbs up). Thank you!!

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The reaction that will occur the fastest via elimination-addition: Br o NH2 NH2 O OH OH Choose the reaction that involves a carbocation intermediate: a Br REACTION A: NH2 CI REACTION B: o OH ci REACTION C: Br2 FeBrg Br REACTION D: OH Rank the following compound by overall energy: Please also state which one has the highest energy, etc.. How many steps are contained in the mechanism of the following reaction? CI AICI