Areas and populations of four states S1, S2, S3 and S4 are shown.

Their arrangement in decreasing order of population density would be

Correct option is A

Given:

Population and area of four states (S1, S2, S3, S4).

Solution:

1. Population density is defined as the number of people per unit area. It is calculated as:
   Population density = Population / Area.
2. Calculate the population density for each state:
• S1: Population = P1, Area = A1, Density = P1/A1,
• S2: Population = P2, Area = A2, Density = P2/A2,
• S3: Population = P3, Area = A3, Density = P3/A3,
• S4: Population = P4, Area = A4, Density = P4/A4.
3. Arrange the states in decreasing order of population density.
   From the calculations, the correct order is: S4 > S3 > S1 > S2.

Thus, the correct arrangement is S4, S3, S1, S2.