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Expression of IdeasMediumExplaining why something is done

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - Ships' hulls below the waterline are painted with 'antifouling' paint. - Barnacles and weed that attach to a hull increase drag. - A heavily fouled hull can raise fuel use by up to 40%. - Antifouling paint slowly releases compounds that deter growth.

The student wants to explain why ships use antifouling paint. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Antifouling paint releases compounds that deter barnacles and weed, whose drag on a hull can raise fuel use by up to 40%.Correct
  2. B. Ships' hulls are painted below the waterline.
  3. C. Barnacles attach to hulls.
  4. D. Fuel is expensive.

Answer: A. Antifouling paint releases compounds that deter barnacles and weed, whose drag on a hull can raise fuel use by up to 40%.

What the paint does and the cost it avoids.

Why the other answers are wrong

B. Ships' hulls are painted below the waterline.
Where it is painted, not why.
C. Barnacles attach to hulls.
The problem without the paint's role.
D. Fuel is expensive.
Not from the notes.

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