The correct answer is B. A plain
Step-by-step explanation:
A plain is a landform with no relief; this implies in a plain there are no mountains, hills, or any other elevation. Moreover, plains are common on Earth and can be found in all continents of the world and most regions. This landform is the one shown in the photo because in this photo there is a great extension of flat and there are no mountains or hill, which are two essential features of plains. According to this, the landform of the photo is plain.