Final answer:
To determine the country with the highest natural increase rate, calculate the difference between the CBR and CDR for each country and compare the results. The correct option is (B).
Step-by-step explanation:
To determine which country has the highest natural increase rate, we need to calculate the difference between the crude birth rate (CBR) and the crude death rate (CDR) for both countries.
For Country A, the natural increase rate can be calculated as: 15.9 - 12.6 = 3.3. For Country B, the natural increase rate can be calculated as: 22 - 13.2 = 8.8. Thus, Country B has the highest natural increase rate.