Answer and explanation

Correct answer: B. for

  1. Step 1: 'Apologise for' + -ing is the standard pattern.
Answer
for.
Why not the others: "of" is wrong because 'apologise' is followed by 'for'. "to" is wrong because 'apologise to' needs a person and cannot be followed by -ing. "about" is wrong because 'apologise about' is not the standard pattern before a gerund.

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