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Expression of IdeasMediumPresenting a before-and-after comparison

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A town replaced its street lights with LED lamps in 2021. - The old lamps used 900,000 kilowatt-hours a year. - The new lamps use 300,000 kilowatt-hours a year. - The new lamps cost $2 million to install. The student wants to emphasise how much electricity the change saved.

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

  1. A. Since switching to LED lamps in 2021, the town's street lights use 300,000 kilowatt-hours a year instead of 900,000, a two-thirds saving.Correct
  2. B. The new lamps cost $2 million to install.
  3. C. The old lamps used 900,000 kilowatt-hours a year.
  4. D. The town replaced its street lights in 2021.

Answer: A. Since switching to LED lamps in 2021, the town's street lights use 300,000 kilowatt-hours a year instead of 900,000, a two-thirds saving.

Before, after, and the saving.

Why the other answers are wrong

B. The new lamps cost $2 million to install.
Cost, not electricity.
C. The old lamps used 900,000 kilowatt-hours a year.
Before only.
D. The town replaced its street lights in 2021.
The change without figures.

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