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hard · Enhanced ACT English

Mapping a flooded cave is painstaking work. Survey divers inch along a fixed guideline, recording depth, compass bearing, and passage width at every station, all while monitoring their air supply in total darkness. [However,] a single hour underwater can generate weeks of drafting once the team returns to the surface.

Given that all the choices are grammatically acceptable, which one provides the most logical transition to the final sentence?

  1. NO CHANGE
  2. Indeed,
  3. By contrast,
  4. Otherwise,

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