The rain showers have continued over a particular area for several days means that a warm front is formed over there due to which slow rainfall will occur over a large area for long period of time. Hence, option A is correct.
What is a Warm Front?
In meteorology, a warm front is the leading edge of a warm air mass that advances as a "front," slides over a colder air mass, and replaces the latter by expelling the latter as it passes.
The border between the two air masses is less obvious than it is at the cold front because it is farther away.
When tropical air collides with polar air that is cooler, a warm front is created. Due to the warmer air's reduced density and impending warm front, the atmospheric pressure drops as the temperature rises. As a result of the warm front's longer slope than the cold front's, different kinds of clouds and amounts of precipitation result. Usually, layer clouds like stratus or cirrus can be seen above the warm front.
When a cold front catches up to a warm front and the energy of both fronts combines, it can occasionally cause an occlusion since the warm front moves more slowly than the cold front. A strong depression (low pressure) arises shortly before the warm air is forced upward.
Hence, a warm front must occur where rain showers continued over a particular area for a long period of time.
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