Chapter 8, Problem 38R

To determine

To choose: The correct option.

Answer to Problem 38R

Option (B)

Explanation of Solution

Introduction:

The values from the graph are calculated by the point of intersection of the corresponding quantity on the horizontal axis and corresponding quantity on the vertical axis.

Consider the given graph as shown below.

  

The horizontal axis of the graph describes the year and vertical axis describes the human population in corresponding to that year. The human population for the year 1960 is 3 billion and for the year 2010 is 6.8 billion.

The difference of the human population in the year 1960 and 2010 gives the increase the word population. The difference of the human population for the year 1960 and year 2010 is the difference of 6.8 billion and 3 billion. The difference of the human population is 3.8 billion, so the option (B) is correct.

The difference of the human population between the years 3.8 billion not the 1 billon, 4.2 billon and 5.9 billon, so the options other than option (B ) are incorrect.

Conclusion:

Thus, the option correct option is B.