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Standard English ConventionsHardColon before an explanation

Standard English Conventions practice question

Visitors are often alarmed to feel the footbridge move, but the reason it sways is ____ it was engineered to flex with the wind rather than resist it.

Which choice completes the text so that it conforms to the conventions of Standard English?

  1. A. simple:Correct
  2. B. simple;
  3. C. simple,
  4. D. simple

Answer: A. simple:

The second clause explains the first, and a colon introduces that explanation: 'The reason the bridge sways is simple: it was designed to.'

Why the other answers are wrong

B. simple;
A semicolon merely links; the colon signals that what follows explains 'simple.'
C. simple,
A comma splices the two complete clauses.
D. simple
No punctuation runs the clauses together.

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