Error spotting — Identify the erroneous piece (A/B/C) or D if correct: 'Unless you stop to make noise at once / I will have no option but to / bring the matter to the attention of the police. / No error.' Focus on gerund vs. infinitive after 'stop' and correct collocation 'stop making noise'.

Concept/Approach (verb pattern after 'stop')
'Stop to + verb' means 'pause in order to do something'. Here the meaning is to cease an activity, which requires 'stop + gerund': 'stop making noise'.

Step-by-step correction
A: 'stop to make noise' → 'stop making noise'.Corrected sentence: 'Unless you stop making noise at once, I will have no option but to bring the matter to the attention of the police.'

Common pitfalls
Confusing 'stop to do' (purpose) with 'stop doing' (cessation).

Final Answer
A — Use 'stop making noise'.