The specific chemical reaction and the structures for the options are missing from the input data. In organic chemistry, the major product of a reaction is typically determined by evaluating the reaction mechanism, such as Markovnikov's rule for electrophilic additions, Zaitsev's rule for elimination reactions, or the relative stability of reactive intermediates (like carbocations, carbanions, or free radicals) formed during the process.

Note: The exact chemical structures were missing from the provided text. Option 4 is marked correct based on the provided probable answer.