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Expression of IdeasMediumExplaining a cause

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - Old church bells are cast from bronze, a mix of copper and tin. - Adding more tin makes the bronze harder but more brittle. - Bell founders used about 20% tin, more than in most bronze. - The harder alloy rings with a clearer, longer note.

The student wants to explain why bell founders used more tin than other bronze workers. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Extra tin makes bronze harder, and a harder bell rings with a clearer, longer note — so founders used about 20% tin despite the brittleness.Correct
  2. B. Bells are cast from bronze.
  3. C. Bronze is a mix of copper and tin.
  4. D. Bell founders used about 20% tin.

Answer: A. Extra tin makes bronze harder, and a harder bell rings with a clearer, longer note — so founders used about 20% tin despite the brittleness.

The effect of tin and the reason it was worth the brittleness.

Why the other answers are wrong

B. Bells are cast from bronze.
The material, not the reason for the recipe.
C. Bronze is a mix of copper and tin.
A definition, no reason.
D. Bell founders used about 20% tin.
The recipe without the reason.

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