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Craft and StructureMediumFunction of a sentence giving a reason

Craft and Structure practice question

The lighthouse's lamp room is painted white inside, floor to ceiling. The choice was practical, not decorative: white showed the smallest smut of soot, so the keeper could not leave the lenses uncleaned.

Which choice best describes the function of the second sentence?

  1. A. It explains the practical reason for the choice of colour described in the first sentence.Correct
  2. B. It describes the view from the lamp room.
  3. C. It argues that lighthouses should be repainted.
  4. D. It criticises the keeper for laziness.

Answer: A. It explains the practical reason for the choice of colour described in the first sentence.

The colour, then why: soot shows on white.

Why the other answers are wrong

B. It describes the view from the lamp room.
No view is described.
C. It argues that lighthouses should be repainted.
No such argument.
D. It criticises the keeper for laziness.
The keeper is not criticised; the colour prevented laziness.

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