16Hit1600
Expression of IdeasHardPresenting a claim with its supporting evidence

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A city replaced 4,000 sodium streetlights with LEDs in 2021. - Street-lighting electricity use fell from 9.5 to 4.2 gigawatt-hours a year. - Residents reported that the streets looked brighter. - The LEDs are expected to last fifteen years.

The student wants to support the claim that the LED switch cut electricity use substantially. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. After the city replaced 4,000 sodium streetlights with LEDs, street-lighting electricity use fell from 9.5 to 4.2 gigawatt-hours a year — a cut of more than half.Correct
  2. B. Residents reported that the streets looked brighter.
  3. C. The LEDs are expected to last fifteen years.
  4. D. The city replaced 4,000 streetlights in 2021.

Answer: A. After the city replaced 4,000 sodium streetlights with LEDs, street-lighting electricity use fell from 9.5 to 4.2 gigawatt-hours a year — a cut of more than half.

The before-and-after figures, with the size of the cut.

Why the other answers are wrong

B. Residents reported that the streets looked brighter.
Brightness, not electricity.
C. The LEDs are expected to last fifteen years.
Lifespan, not electricity.
D. The city replaced 4,000 streetlights in 2021.
The action without its effect.

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