Answer:
Option C: more equality between urban and rural living standards
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.
Hurricane Katrina formed over Southeastern Bahamas.
At that time it was still a tropical storm - not yet as devastating.
It then moved over Florida (around Florida is when it turned into a hurricane) and later into the Gulf of Mexico, where it gained strength and finally, it traveled towards the mainland of US.
The whole existance of Katrina, from its beginning until its dissipation lasted 8 days.
The answer to your question is Arrow D.
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