The answer is D. India developed and maintained a securely centralized and powerful empire that lasted for centuries.
Hundreds of thousands died of disease. Roughly 2% of the population, an estimated 620,000 men, lost their lives in the line of duty. Taken as a percentage of today's population, the toll would have risen as high as 6 million souls. The human cost of the Civil War was beyond anybody's expectations.
Depending on what mjesurement it is in miles its like about 2.4 miles