The correct answer is option 3, i.e., both statements 1 and 2 are correct.

In the first statement, the monsoon duration is related to its geographical progression. As monsoons in India typically start from the southern region and move towards the north, the duration naturally decreases from south to north.

The second statement discusses the pattern of annual rainfall across the northern plains of India. Due to the Bay of Bengal`s influence and its originating moisture-laden winds from the East, the rainfall decreases as it moves from the east to the west.

So, both of these statements reflect the geographical and meteorological patterns of monsoons and rainfall distribution in India. Therefore, both are considered correct.