Triple

Target entity: Anglo-Siamese Treaty of 1909
Context triple: [Rattanakosin Kingdom (Siam), event, Anglo-Siamese Treaty of 1909]

• A. Pangkor Treaty of 1874
  The Pangkor Treaty of 1874 was an agreement between the British and Malay rulers that marked the beginning of formal British political control in the Malay Peninsula by establishing a British Resident in Perak.
• B. Anglo-Siamese agreements on frontier delimitation chosen
  The Anglo-Siamese agreements on frontier delimitation were a series of late 19th- and early 20th-century treaties between Britain and Siam that defined their mutual borders in mainland Southeast Asia, particularly in regions such as the Shan States and the Malay Peninsula.
• C. Treaty of Yandabo
  The Treaty of Yandabo was the 1826 peace agreement that ended the First Anglo-Burmese War, forcing Burma to cede territory, pay a large indemnity, and accept a British resident, marking a major expansion of British influence in Southeast Asia.
• D. Kandyan Convention
  The Kandyan Convention was an 1815 treaty by which the British Empire annexed the Kingdom of Kandy, ending Sri Lanka’s last independent monarchy and establishing full colonial rule over the island.
• E. Treaty of 1819 with Sultan Hussein Shah of Johor
  The Treaty of 1819 with Sultan Hussein Shah of Johor was an agreement that enabled the British East India Company to establish a trading post in Singapore, laying the foundation for modern Singapore as a British colony.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.