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Craft and StructureMediumFunction of a sentence giving an example

Craft and Structure practice question

Not every invention finds its use at once. The laser, for instance, was described at its birth as a solution looking for a problem, and it was a decade before anyone thought of using it to read a barcode.

Which choice best describes the function of the second sentence?

  1. A. It gives an example that illustrates the first sentence's claim.Correct
  2. B. It explains how a laser works.
  3. C. It argues that lasers are useless.
  4. D. It contradicts the first sentence.

Answer: A. It gives an example that illustrates the first sentence's claim.

"for instance": an example of a delayed use.

Why the other answers are wrong

B. It explains how a laser works.
No mechanism.
C. It argues that lasers are useless.
Lasers found a use.
D. It contradicts the first sentence.
It supports the claim.

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