Triple

Target entity: Glenn L. Martin Company
Context triple: [Martin Baltimore, manufacturer, Glenn L. Martin Company]

• A. Glenn L. Martin Company chosen
  The Glenn L. Martin Company was a pioneering American aerospace and aircraft manufacturing firm that played a major role in early military and civilian aviation and later became part of the conglomerate that evolved into Lockheed Martin.
• B. United Aircraft Corporation
  United Aircraft Corporation is a major Russian aerospace and defense company that designs and manufactures civilian and military aircraft.
• C. United Aircraft Corporation
  United Aircraft Corporation was the original name of the American industrial conglomerate that evolved into United Technologies Corporation, a major aerospace and defense company.
• D. United Aircraft and Transport Corporation
  United Aircraft and Transport Corporation was a major early 20th-century American aviation conglomerate that combined aircraft manufacturing and airline operations before being broken up by antitrust legislation.
• E. A.V. Roe and Company
  A.V. Roe and Company, commonly known as Avro, was a British aircraft manufacturer renowned for producing iconic military and civilian aircraft during the first half of the 20th century.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.