We are looking for the most polite yet concise way to make a request.
Option (A) is overly formal and wordy, using “I request you to kindly deliver to me,” which is not necessary in conversational English.
Option (C) is also overly formal and repeats the politeness unnecessarily by using both “May I request” and “please send.”
Option (D) is conversational but less direct and slightly awkward because “Can I have milk powder sent to me please?” is a request about possibility rather than a straightforward request for action.
Option (B) “Could you please send me a tin of milk powder?” is polite, clear, and direct — it makes the request in the fewest words without losing politeness.