What is one reason for high population in cities?

Correct answer: Availability of jobs and services

The direct answer is Option A: availability of jobs and services is a major reason for high urban population. Cities usually provide more factories, offices, shops, schools, colleges, hospitals, transport links and other services than many rural areas. These opportunities attract people from villages and smaller settlements, a movement called migration. Cities can therefore grow through both natural population increase and in-migration. Option A is correct because employment and services create a strong urban pull. Option B is wrong because constant snowfall is not a general feature of cities and would often discourage settlement. Option C is wrong because some cities have farming around them, and the absence of farming is not the main reason for urban population. Option D is wrong because drying of the sea is unrelated to ordinary urban population concentration. Remember: jobs, education, health care and facilities are common urban pull factors.