Select the option below that most accurately describes the global population over the past decade Select one: a. The global population has increased over the past decade. However, the population size did not increase in all countries throughout the world, and many countries experienced a decline in population size. b. The global population has increased over the past decade, with increases in the national population of every country. Some countries experienced a large increase in their population whilst in other countries the increase was relatively small. c. The global population has decreased over the past decade. Although there has been national population increases in some countries, particularly in sub-Saharan Africa, the decline in birth rates and increasing mortality has led to overall global population decline. d. The global population has decreased over the past decade, with all countries experiencing a decline or plateau in their national population size