Question

Relief Rainfall is also known as __________.
    A. Orographic rainfall
    B. subsistence rainfall
    C. both a and b
    D. none of these

Answer 1

Hint: Mountains may have a substantial influence on precipitation. The air is forced to climb above this barrier as it enters the mountains. When the air travels up a mountain's windward side, it cools, and the volume decreases. As a consequence, humidity increases, and precipitation.

Step by step answer:
Relief rainfall is formed when the air cools as it rises over relief features in the landscape such as hills or mountains. As the hot air rises up it cools and condenses and as a result rainfall occurs. In the Pennines, UK the prevailing winds bring lots of rain in the west of U.K.
Relief rainfall occurs when warm moist air rises over mountains from the Atlantic Ocean. It cools and condenses as the warm air rises, to form clouds, which carry rain. It descends and warms until the air has passed over the mountains. That’s why it is called Relief rainfall.
Silent features:
Orographic precipitation, also referred to as relief precipitation, is precipitation produced upon encountering a physiographic upland by a forced upward movement of air (see anabatic wind). Two mechanisms may cause this lifting: the upward deflection of large-scale horizontal flow by the orography. Orographic rainfall is also known as relief rainfall occurs in areas where the land rises in height. Due to the prevailing weather coming from that direction, it is very popular on the west coast of the United Kingdom.
So, the correct answer is Option :

Note Orography means - A physical geography division that deals with mountains.
In the mountain areas along the western coast, the highest rainfall total of over 1,600 mm per year occurs.