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Question 234·Hard·Transitions

Many coastal cities have invested heavily in constructing concrete seawalls to mitigate flooding. Recent studies, however, question the long-term effectiveness of these barriers. ______ in Galveston, Texas, researchers documented that while the city's century-old seawall reduced wave impact, it also accelerated beach erosion, ultimately leading to higher flood risks for adjacent neighborhoods.

Which choice completes the text with the most logical transition?