Write a multi-choice question for the following article, with the given choices and answer: Article: Around 200 people who thought their only experience of the London 2012 Olympic Games would be minor heats of synchronized swimming have received an unexpected hange to the men's 100m final because of an embarrassing ticketing mistake. The London 2012 Organising Committee (Locog) confirmed on Wednesday that an error n its ticket selling had led to four synchronised swimming competitions being oversold by 10, 000 tickets. Locog and its ticket agent spent the Christmas period contacting ticket holders and offering them alternatives that included the tickets they had applied for but unsuccessful.The hanges need no additional cost.It has also offered to return any discrepancy if the n ew tickets cost less than the originals.Locog said the replacement tickets would come from a number of unsold seats across the Olympic Games and _ was doing all it could to make up the error to the fans who bought tickets. Locog said the error occurred in the summer, between the first and second round of ticket sales, when a member of staff made a mistake, entering "20,000" into the computer rather than the correct figure of 10,000 remaining tickets.The error was discovered when Locog checked the number of tickets that had been sold against the final seating numbers, and began contacting ticket holders before Christmas. Thousands of ticket holders have already struck lucky, changing to tickets for major events including swimming and athletics finals, and in around 200 cases the hottest of all, the men's 100m final.Locog said the decision to award 100m final tickets was made because one of the synchronised swimming competitions was on the same afternoon as the event, August 5. Options: A 200. B 10,000. C 20,000. D 30,000. Answer: B 10,000. Question:
Answer:
How many ticket holders will have to change their tickets?