The major product formed in the following reaction is

Explanation:

Step 1: Protonation and addition of Br

Step 2: Fischer esterification (by MeOH) in presence of acid

Step 3: Arbuzov reaction

The reaction of a trialkyl phosphite with an alkyl halide to produce an alkyl phosphonate. The first step involves nucleophilic attack by the phosphorus on the alkyl halide, followed by the halide ion dealkylation of the resulting trialkoxyphosphonium salt.

Step 4: Hydrolysis

Conclusion:
The correct answer is option 2.