Which one among the following is common to the treaty of Yandaboo (1826), the treaty of Salbai (1782) and the treaty of Gandamak (1879)?

• A

  With these treaties various Indian powers formed alliances to defeat the British
• Correct answer
  B

  These treaties enabled the British to control the South Asian powers
• C

  These treaties expedited the spread of Indian culture abroad
• D

  These treaties gave an essential boost to enhanced trade in South Asia

Hence, the correct answer is option: 'B'.