The correct answer is A. Pitched and sloping roof.
A pitched roof is a roof with two or more slopes that meet at a ridge. The slopes are typically made of shingles, tiles, or metal. Pitched roofs are designed to shed water and snow, and they are often used in areas with high rainfall or snowfall.
A flat roof is a roof with a single, level surface. Flat roofs are typically made of concrete, asphalt, or metal. Flat roofs are often used in areas with low rainfall or snowfall.
A shell roof is a roof that is made of a single, curved surface. Shell roofs are typically made of concrete or metal. Shell roofs are often used in large, open spaces.
In plains where rainfall is meagre and temperature is high, a pitched and sloping roof is the most suitable type of roof. This is because a pitched roof is designed to shed water and snow, and it is also able to withstand high winds. A flat roof would not be suitable in this climate, as it would be more likely to leak and would not be able to withstand the high winds. A shell roof would also not be suitable, as it would be more expensive to build and would not be as effective at shedding water and snow.