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Expression of IdeasMediumExplaining the reason behind a practice

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - Ship hulls are painted with a red-brown coating below the waterline. - The coating contains copper compounds. - Copper deters barnacles and algae from attaching to the hull. - A fouled hull can raise a ship's fuel use by 40%.

The student wants to explain why ship hulls are coated below the waterline. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. The copper in the coating deters barnacles and algae, whose growth on a hull can raise fuel use by 40%.Correct
  2. B. The coating is red-brown.
  3. C. Ships use a lot of fuel.
  4. D. Barnacles live in the sea.

Answer: A. The copper in the coating deters barnacles and algae, whose growth on a hull can raise fuel use by 40%.

Copper, deterrence, and the fuel cost avoided: the reason.

Why the other answers are wrong

B. The coating is red-brown.
Colour, not reason.
C. Ships use a lot of fuel.
A generality that omits the coating.
D. Barnacles live in the sea.
Not an explanation.

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