The 1973 uprising in Sikkim was a turning point because it:

The correct answer is: a) Led to the Chogyal’s abdication.

The 1973 uprising in Sikkim was a popular uprising against the rule of the Chogyal, the hereditary ruler of Sikkim. The uprising was led by the Sikkim National Congress, a political party that sought to end the Chogyal’s rule and integrate Sikkim into India. The uprising was successful, and the Chogyal was forced to abdicate in 1975. Sikkim became an Indian state in 1975.

The other options are incorrect because:

• Option b) is incorrect because the British did not intervene in the 1973 uprising.
• Option c) is incorrect because India’s involvement in Sikkim’s affairs increased after the 1973 uprising, not before.
• Option d) is incorrect because the 1973 uprising did not pave the way for a peaceful resolution. The uprising was a violent conflict that resulted in the Chogyal’s abdication.