The native State of Tripura became involved in the Freedom Movement early in the 20th century because of which reason?

A. the kings of Tripura were always anti-British

B. the Bengal revolutionaries took shelter in Tripura

C. the tribes of the State were fiercely freedom loving

D. there were already some groups fighting against the kingship and its protector, the British

D. there were already some groups fighting against the kingship and its protector, the British