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The first time that the United States successfully launched a rocket into space was in 1958. That event, which some historians consider the start of the space race, was a major turning point in human history.

SAT · English · previous-year question

  1. A.That event, some historians consider the start of the space race, was a major turning point in human history.
  2. B.That event, which some historians consider the start of the space race, was a major turning point in human history.correct
  3. C.That event some historians consider the start of the space race, was a major turning point in human history.
  4. D.That event, some historians consider the start of the space race, was a major turning point in human history.

Answer

B. That event, which some historians consider the start of the space race, was a major turning point in human history.

Explanation

Choice B is the best answer because it correctly combines the two sentences using a relative clause introduced by "which." This relative clause correctly modifies the noun phrase "That event" by providing additional information about it. The other choices are incorrect because they fail to use the correct punctuation or grammatical structure.

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