The correct answer is: a) Khuangchera.
Khuangchera was a Mizo chief who resisted British colonial rule in the late 19th century. He was the chief of the Lakher tribe and led a rebellion against the British in 1891. The rebellion was unsuccessful, but Khuangchera is still remembered as a hero by the Mizos.
Rothangpuia was a Mizo chief who was also a British ally. He was the chief of the Lushai tribe and helped the British to suppress the rebellion led by Khuangchera.
Lallula was a Mizo chief who was a British subject. He was the chief of the Chakma tribe and served as a British official.
Zawvela was a Mizo chief who was a British collaborator. He was the chief of the Mara tribe and helped the British to suppress the rebellion led by Khuangchera.
Khuangchera was the only one of these chiefs who resisted British colonial rule. The others were either British allies or collaborators.