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Verbal·Expression of Ideas·Transitions

hard

The prime meridian, the global indicator of zero degrees longitude established in 1884, was originally determined using astronomically derived coordinates.        as decades passed, new calculations would reveal increasingly precise coordinates, yet the prime meridian remained unchanged; it wasn’t until the 1980s that, spurred by improved geodetic data, the prime meridian was officially moved—roughly one hundred meters east.

Which choice completes the text with the most logical transition?

A

Specifically,

B

Again and again,

C

Granted,

D

To that end,