challenge: Who took a controlling stake of 57.5% in PoliticsHome in September 2009?
  
  A. Lord Ashcroft, an independent businessman
  B. Lord Ashcroft, the then-Deputy Chairman of the Liberal Democrats
  C. Lord Ashcroft, the then-Deputy Chairman of the Conservative Party
  D. Lord Ashcroft, the then-Deputy Chairman of the Labour Party
  Answer: 