Answer:
Option C: more equality between urban and rural living standards
Step-by-step explanation:
In most countries with primate cities, there is a great imbalance in development. The biggest city may hold a great share of the country's entire population, about 35 - 45%.
On the contrary, countries who follow the rank-size rule, have more balanced cities, with great populations and levels of development. This increases the living standards in both rural and urban regions because people from rural areas don't need to go to one big city to get employment, opportunities, education, etc.