The given sentence is an assertive sentence and not a question. Hence, it has to end with a full stop and not a question mark.
Option A ends with a question mark and not a full stop. Hence it is incorrect.
Option B is incorrect as 'n' in 'New' is not capitalized.
Option C is incorrect as the letters 'm' in 'Mr' and 'd' in 'Das' are not capitalized.
Option D: In this option, the letters, 'm' in 'Mr', 'd' in "Das' and 'Delhi' and 'n' in 'New' are all capitalized. The sentence ends with a full stop. Hence, it is correctly punctuated and this option is correct.