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The sentences given below, when properly sequenced, form a coherent paragraph. Each sentence is labeled with a letter. Choose the most logical order of sentences from among the given choices to construct a coherent paragraph.

1. This fact was established in the $1730$s by French survey expeditions to Equator near the Equator and Lapland in the Arctic, which found that around the middle of the earth the arc was about a kilometer shorter.
2. One of the unsettled scientific questions in the late 18th century was the exact nature of the shape of the earth.
3. The length of the one-degree arc would be less near the equatorial latitudes than the poles.
4. One way of doing that is to determine the length of the arc along a chosen longitude or meridian at one degree latitude separation.
5. While it was generally known that the earth was not a sphere but an ‘oblate spheroid’ more curved at the equator and flatter at the poles, the question of ‘how much more’ was yet to be established.
2. BEDCA
3. BDACB
4. EBDCA