Big Ben is the famous clock tower associated with the parliament of

Big Ben is the nickname given to the Great Bell and by common use the entire clock at the Palace of Westminster in London. It is one of the most recognizable landmarks of the United Kingdom and serves as a symbol of the British parliamentary system. Its hourly chimes are broadcast across the country and mark important events. The tower has been renamed Elizabeth Tower but Big Ben remains the popular title. As the clock is part of the UK parliament buildings the correct choice is option B.