The correct answer is: A. Lesser value
The arithmetical increase method of forecasting population assumes that the population will increase at a constant rate each year. The geometrical increase method of forecasting population assumes that the population will increase at an increasing rate each year. Therefore, the arithmetical increase method will always give a lower value than the geometrical increase method.
Here is a simple example to illustrate the difference between the two methods. Let’s say that the current population is 100, and the annual growth rate is 5%. Using the arithmetical increase method, the population in 1 year will be 100 + 5 = 105. Using the geometrical increase method, the population in 1 year will be 100 * 1.05 = 105.05. As you can see, the geometrical increase method gives a higher value than the arithmetical increase method.
The arithmetical increase method is a simpler method to use, but it is not as accurate as the geometrical increase method. The geometrical increase method is more accurate, but it is more complicated to use.