The student wants to explain why each lighthouse flashes in a unique pattern. Which choice most effectively uses relevant information from the notes to accomplish this goal?

Question

While researching a topic, a student has taken the following notes:
- Each lighthouse flashes its light in a unique pattern.
- The pattern is called the lighthouse's 'characteristic'.
- Sailors match the pattern they see to a chart listing every lighthouse's characteristic.
- This tells them which lighthouse they are looking at, and so where they are.

Accepted Answer

A. Each lighthouse flashes in its own pattern so that sailors, matching it to a chart, can tell which lighthouse they are seeing and therefore where they are.. The goal is WHY. Choice A gives the purpose: identification, and so position.

Answer

B. A lighthouse's flash pattern is called its characteristic. — A name, not a purpose.

Answer

C. Sailors carry charts of lighthouses. — A fact about sailors with no explanation of the patterns.

Answer

D. All lighthouses flash in the same pattern so that sailors can recognise them. — The notes say each pattern is UNIQUE.

Expression of Ideas practice question

Answer: A. Each lighthouse flashes in its own pattern so that sailors, matching it to a chart, can tell which lighthouse they are seeing and therefore where they are.

Why the other answers are wrong

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