The correct answer is: a) Vanhimailian.
Vanhimailian was a Mizo chief who led a rebellion against the British in 1895. The rebellion was unsuccessful, but it is remembered as an important event in Mizo history.
Tirot Sing was a Khasi chief who led a rebellion against the British in 1829. The rebellion was also unsuccessful, but it is remembered as an important event in Khasi history.
Bir Tikendrajit Singh was a Manipuri prince who led a rebellion against the British in 1891. The rebellion was unsuccessful, and Bir Tikendrajit Singh was executed.
Khuongchera was a Mizo chief who was a signatory to the Treaty of Yandabo in 1826. The treaty ended the First Anglo-Burmese War, and it ceded the Mizo Hills to the British.
Vanhimailian was a more important figure in Mizo resistance to British colonialism than any of the other options. He was the leader of a major rebellion against the British, and his actions are remembered as an important event in Mizo history.