To answer this question, you need to be familiar with the terms used to refer to people from Manchester.
Option A) Mancheterite - This option is incorrect because "Mancheterite" is not the correct term used to refer to people from Manchester.
Option B) Manchesian - This option is incorrect because "Manchesian" is not the correct term used to refer to people from Manchester.
Option C) Mantian - This option is incorrect because "Mantian" is not the correct term used to refer to people from Manchester.
Option D) Mancunian - This option is correct because "Mancunian" is the term used to refer to people from Manchester.
The correct answer is Option D) Mancunian. This option is correct because it is the term commonly used to refer to people from Manchester.