The important contribution to navigation made by Eratosthenes in the third-century bc was a reasonably accurate calculation of the circumference of our planet.
Who is Eratosthenes?
Eratosthenes was born in 276 BC and died in 194 BC. He was a well-known poet, mathematician, a researcher in geography, and theorist of music. He was the first to gauge the size of the planet.
The Earth was first measured by Eratosthenes of Cyrene. The precise measurement of Earth's circumference was greatly aided by Eratosthenes' work in the third-century bc.
As a result, the Eratosthenes in the third century bc accurate calculation of the Earth.
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From what I can see there are multiple correct answers. B and C are both correct. If you can only pick one I'd go with C. More recently businesses have moved more into cities.
The administration faced political opposition in 1994 when Republicans took control of both houses of congress but Clinton was reelected in 1996, after a failed attempt at a health care reform.
