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Lillian enjoys looking at maps. Last weekend, she looked at a map that showed the elevation of the highest cities in the world, all of which are at least $4,500$ meters above sea level. Of the $16$ cities on the list, $11$ are in Asia and the other $5$ are in South America. The median elevation of the cities is $4,727.5$ meters above sea level, and the interquartile range is $305$ meters.$\newline$Which is a measure of how much the cities' elevations vary?$\newline$Choices:$\newline$(A) $11$ meters$\newline$(B) $305$ meters$\newline$(C) $4,500$ meters$\newline$(D) $4,727.5$ meters