The correct answer is - semiarid steppe.
Mongolia in general is a pretty high land, and mostly it is a plateau. Because of its height, the rain that comes from the east stops before it reaches its territory, so China gets most of the rain, while Mongolia only very small amounts. Most of the country is steppe, apart from the northern part which is part of the taiga.
Mongolia is a very sunny country, and a cloudy sky is a pretty rare sight. It has a very sunny, warm, and dry summers, while the winters are extremely cold, and dry in most of the country. The temperature during the summer can go over 30 °C, while in winter they drop bellow 40 C°, so the variation of the temperature is one of the greatest in the world.