Triple

Target entity: London Underground network
Context triple: [Wembley Park, isOnNetwork, London Underground network]

• A. London Underground chosen
  The London Underground is a rapid transit system serving Greater London and surrounding areas, famous as one of the world's oldest and most extensive metro networks.
• B. London Underground and Elizabeth line
  The London Underground and Elizabeth line are major rail networks in London, with the former being the city’s historic metro system and the latter a modern high-capacity cross-city railway.
• C. London Overground
  London Overground is a suburban rail network in London that connects outer districts and some central hubs using a mix of newly built and former National Rail lines, integrated into the city’s public transport system.
• D. London Thameslink network
  The London Thameslink network is a cross-London rail system that connects a wide range of suburban and regional routes through central London via a core north–south corridor.
• E. District Railway
  The District Railway was a historic London underground railway company that developed much of what is now the District line, helping to form the core of the city's early subterranean transport network.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.