01 Which factor most directly affects population distribution through migration?
Answer and explanation
Correct answer: D. Employment opportunities
Explanation: Direct answer: D, employment opportunities. Migration involves people changing their place of residence, and employment is a direct reason for many such moves. Step by step, a region with available jobs offers the possibility of income; workers may move toward it, while unemployment may push people away from another region; this changes the number and distribution of people in both places. A is incorrect because soil color alone does not usually create a migration decision. B is incorrect because mountain shape may affect accessibility, but it is not the direct economic attraction named here. C is incorrect because cloud type is a weather observation, not normally an employment-related pull factor. D is therefore the clearest answer. Other factors such as safety, education, family links, and services can also influence migration. Memory cue: jobs pull people; lack of jobs can push them away.