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Expression of IdeasHardExplaining a surprising result

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A city added a fourth lane to its main highway in 2019. - Traffic engineers predicted shorter journey times. - By 2022, journey times were longer than before the lane was added. - Surveys found that many people who had used trains switched to driving once the road was wider. The student wants to explain why the expected result did not occur.

Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Journey times grew longer after the fourth lane was added because many former train users switched to driving once the road was wider, filling the new capacity.Correct
  2. B. A fourth lane was added in 2019.
  3. C. Traffic engineers predicted shorter journey times.
  4. D. By 2022, journey times were longer than before.

Answer: A. Journey times grew longer after the fourth lane was added because many former train users switched to driving once the road was wider, filling the new capacity.

The result and its cause.

Why the other answers are wrong

B. A fourth lane was added in 2019.
The change, no explanation.
C. Traffic engineers predicted shorter journey times.
The prediction, no explanation.
D. By 2022, journey times were longer than before.
The result, no explanation.

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