Triple

Target entity: Metropolitan Railway
Context triple: [Wembley Park, originalOperator, Metropolitan Railway]

• A. Metropolitan Railway chosen
  The Metropolitan Railway was the pioneering underground railway in London and the world’s first urban underground passenger railway, forming the core of what became the London Underground.
• B. Central London Railway
  Central London Railway was an early deep-level underground railway in London that later became the core of the London Underground's Central line.
• C. Metropolitan District Railway
  The Metropolitan District Railway was a historic London railway company that developed much of what is now the District line of the London Underground in the late 19th and early 20th centuries.
• D. Underground Electric Railways Company of London
  The Underground Electric Railways Company of London was the early 20th-century holding company that developed and operated much of London's deep-level tube network, forming the core of what became the London Underground.
• E. City and South London Railway
  The City and South London Railway was the world's first deep-level electric tube railway in London, forming a key precursor to today's Northern line of the London Underground.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.