Closing of a letter to the Municipal Commissioner from a citizen will be :

Correct option is B

“Yours faithfully” is the standard formal closing for a letter addressed to an unknown person, authority or organization—here, a Municipal Commissioner. It conveys respect and formality, maintaining the decorum appropriate for official or impersonal communication.
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Information Booster

Letter writing conventions (genre/rules) require that “Yours faithfully” closes letters where the correspondent has addressed the recipient by designation (e.g., “Sir/Madam” or “The Municipal Commissioner”), while “Yours sincerely” is used when addressing by name.

Indian English writing manuals and official templates follow this rule, especially in bureaucratic or governmental letters.

Additional Knowledge

(1) “Yours obediently” is outdated and rarely used outside very hierarchical contexts.

(3) “Yours affectionately” is reserved for personal/familial letters.

(4) “Yours sincerely” is formal, but conventionally used when you begin “Dear Mr. [Name].”