The question statement appears incomplete: it says "What is the major product formed by HI on reaction with" but the actual substrate/structure is missing, and all four options are blank.

Because the reactant is not provided, the product cannot be determined uniquely.

Step 1: What is needed to solve this

To identify the major product of reaction with HI, we must know the starting compound. For example, HI reacts differently with:

1. Alcohols  alkyl iodides may form
2. Ethers  cleavage to alcohol + alkyl iodide or two alkyl iodides
3. Alkenes  hydroiodination products
4. Epoxides  ring-opened iodohydrins
5. Haloalkanes / haloarenes derivatives  substitution/elimination behavior depends on structure

So without the substrate, there is no chemically valid way to choose A/B/C/D.

Step 2: Comparison with stored correct answer

The stored correct answer is D, but since the actual reactant and options are missing, this cannot be verified from the provided information.

Conclusion

The problem is incomplete, so the answer cannot be determined uniquely from the given data.

Please provide the missing reactant structure (image or formula) and the option structures so I can solve it properly.