Triple

Target entity: Andrew Jackson Downing
Context triple: [A Treatise on the Theory and Practice of Landscape Gardening, author, Andrew Jackson Downing]

• A. Andrew Jackson Downing chosen
  Andrew Jackson Downing was a pioneering 19th-century American landscape designer and writer who helped shape the principles of landscape architecture and suburban garden design in the United States.
• B. Alexander Jackson Davis
  Alexander Jackson Davis was a prominent 19th-century American architect best known for his influential Greek Revival and Gothic Revival designs, including numerous public buildings and country houses.
• C. Frederick Law Olmsted
  Frederick Law Olmsted was a pioneering 19th-century American landscape architect best known for designing major urban parks such as New York City's Central Park and Boston's Emerald Necklace.
• D. Calvert Vaux
  Calvert Vaux was a 19th-century British-American architect and landscape designer best known for co-designing New York City's Central Park and contributing to many of its major public buildings and spaces.
• E. Thomas N. Downing
  Thomas N. Downing was an American Democratic congressman from Virginia known for his role in initiating and leading congressional investigations into the assassinations of President John F. Kennedy and Dr. Martin Luther King Jr.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.