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Expression of IdeasMediumExplaining a cause

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A town's river turned bright green for two days in May. - The colour came from a harmless dye used to trace leaks in the sewer system. - The dye was added by the water company. - Residents reported the colour to the police. The student wants to explain why the river turned green.

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

  1. A. The river turned green because the water company had added a harmless dye to trace leaks in the sewer system.Correct
  2. B. Residents reported the colour to the police.
  3. C. The river was green for two days in May.
  4. D. The dye was harmless.

Answer: A. The river turned green because the water company had added a harmless dye to trace leaks in the sewer system.

The cause.

Why the other answers are wrong

B. Residents reported the colour to the police.
The reaction, not the cause.
C. The river was green for two days in May.
The event, no cause.
D. The dye was harmless.
A property of the dye, not the reason for it.

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