The correct answer is: b) Fierce resistance to British rule.
U Tirot Sing was a Khasi leader who led a rebellion against the British East India Company in the 1820s. He is remembered as a national hero for his fierce resistance to British rule.
Option a) is incorrect because U Tirot Sing was a fierce opponent of British rule.
Option c) is incorrect because U Tirot Sing was not involved in the establishment of Shillong.
Option d) is incorrect because U Tirot Sing was not interested in modernizing Khasi society. He was a traditionalist who wanted to preserve Khasi culture and values.