SAT Question edf30612: Transitions answer and explanation

English - Transitions - Contrast Transition
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In the late twentieth century, scholars directed much discussion toward issues of spatiality. Adherents to quantitative analytical approaches delineated space with the use of GIS spatial technologies; ______ cultural geographer Doreen Massey defined space as the product of “an ever-shifting social geometry of power and signification,” focusing instead on socio-political forces.
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Difficulty:Hard
Which choice completes the text with the most logical transition?