Minted.Coins have been struck in Britain for over 2,000 years, but it was not until the 13th century that a properly instituted mint was formed. Sited in the Tower of London between the inner and outer walls, it employed primitive methods of coining money with hand- held tools. In the 17th century, human-powered screw presses were introduced that could strike up to 30 coins per minute.With the advent of the Industrial Revolution, steam-powered machinery was available and a private mint was opened in Birmingham by the entrepreneur Matthew Boulton. He secured contracts for pennies and twopences, producing much higher-quality coins than the Tower, which lacked the space for steam-powered presses. A decision was taken to transfer facilities from the Tower to Tower Hill, where the Royal Mint began production in 1810. The new presses were capable of striking up to 100 coins per minute. UK coins were circulated in various parts of the British Empire, and after the First World War the Royal Mint sought orders from countries all over the world.In 1964 the government decided to adopt a decimal system of currency and a new Royal Mint was constructed in readiness for decimalization on 15 February 1971. The new Mint was constructed at Llantrisant in south Wales in 1967 and the first phase was opened by the queen on 17 December 1968. Later, an up-to-date foundry was installed, followed by engraving, tool-making and assay departments along with a special section for striking proof coins for the collectors market. The original site on Tower Hill was run down once the Llantrisant facility had the full range of minting facilities. Tower Hill struck its last coin in November 1975.

Question: Only Llantrisant could strike special proof coins.
Options:
A. true, B. false, C. uncertain
Answer: "C"