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Explanation:

For all four given regions, growth is negative for the given period. Hence, the annual growth rate is lowest for the region with the greatest magnitude of growth rate.

The annual growth for the given regions is:

North Africa = $\frac{1.59-1.75}{1.75}$ × 100 = -9.14%

North East Asia = $\frac{14.83-16.12}{16.12}$ × 100 = -8%

North America = $\frac{10.98-11.89}{11.89}$ × 100 = -7.65%

EU Countries = $\frac{18.33-20.16}{20.16}$ × 100 = -9.07%

Hence, option (a).