Instructions: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Britons are by far the biggest adopters of contactless payments in Europe as the use of the system continues to climb across the continent, new figures reveal. More than one billion contactless transactions worth €12.6billion took place in Europe over the last 12 months – a three-fold increase when compared to the same period in 2014, according to Visa Europe. Britain is the country with the highest number of contactless transactions, with 52.6million worth more than €330million made in March alone, followed by Poland and Czech Republic, with 49.7million and 13.9million transactions respectively. This rapid growth in the UK was fuelled in part by the launch of contactless payments on Transport for London services last September, Visa Europe said.The UK issues the highest number of contactless cardsBritons made 52.6million transactions worth more than €330million in MarchSome 1.1billion contactless transactions worth €12.6billion were made by Visa cardholders across Europe in the last 12 months 
 Question:Across the continent, 131million Visa contactless cards are carried in the pockets and purses of consumers, of which 49.6million are in the _.
Output:
UK