Answer and explanation

Correct answer: D. Although the experimental data were inconclusive, the team decided to proceed with phase two

  1. Step 1: In formal academic English, 'data' is the plural form of 'datum' and pairs with the plural verb 'were'.
  2. Step 2: An introductory dependent clause starting with 'Although' is correctly separated from the main clause by a single comma.
Answer
Although the experimental data were inconclusive, the team decided to proceed with phase two.
Why not the others: 'Although the experimental data was inconclusive, but the team decided to proceed with phase two' redundantly uses both subordinating conjunction 'Although' and coordinating conjunction 'but'; 'Although the experimental data were inconclusive; the team decided to proceed with phase two' inappropriately places a semicolon after a dependent clause; 'Although the experimental data was inconclusive, the team decided to proceed with phase two nevertheless' contains both singular verb error and redundant 'nevertheless'.

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