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Craft and StructureVery hardFunction of a final sentence that deflates an assumption

Craft and Structure practice question

The company's first robot vacuum cleaner was a flop: it bumped into furniture and could not find its way home to charge. Its second model sold in the millions. The engineers had not made the second robot smarter — its brain was much the same. They had made it slower, and given it a bumper.

Which choice best describes the function of the final sentence?

  1. A. It reveals that the successful fix was modest and mechanical rather than a leap in intelligence.Correct
  2. B. It states that the second robot was faster than the first.
  3. C. It criticises the engineers for not improving the robot.
  4. D. It explains why the first model failed.

Answer: A. It reveals that the successful fix was modest and mechanical rather than a leap in intelligence.

After ruling out a smarter brain, the last sentence names the real change: slower, with a bumper.

Why the other answers are wrong

B. It states that the second robot was faster than the first.
The sentence says the second robot was SLOWER.
C. It criticises the engineers for not improving the robot.
The second model sold in the millions; the sentence explains the success, not a failure.
D. It explains why the first model failed.
The first model's failure is described in the first sentence.

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