The correct option is
C Both a and b
Asian continent experience climatic extremes due to Large extent of the continent and large coastlines.
Asia is the largest continent of the earth, that’s why it has regions of a wide variety of climates; some of the coldest, hottest, wettest and some of the driest places on earth.
Factors that influence climate, are latitudes, distance from the sea, monsoon winds, the direction of mountain ranges, and ocean currents.
A large part of Asia lies more than 1500 km away from the sea. The interior parts of the continent experience extremes of temperature.
Monsoon winds shed their moisture to the south of the Himalayas and mountains of Central Asia.
Ocean currents act much like a conveyer belt, transporting warm water and precipitation from the equator toward the poles and cold water from the poles back to the tropics.