The formation of the state of Kerala in 1956 consolidated regions that were previously under:
ATravancore, Cochin, and the Canara region
BThe state of Travancore-Cochin, and the British Malabar district
CTravancore, Cochin, and the Malabar region of Madras Presidency
DPrincely states of Travancore and Cochin, and parts of the Coimbatore district of Madras Presidency