The correct options are
A The state of Kerala was formed by merging the states of Travancore and Cochin and Kasargod taluk of South Canara district.
B The districts of Hyderabad, Nizamabad, Khammam, Warangal, and Nalgonda were merged with the state of Andhra Pradesh.
C The state of Punjab was formed by merging the state of Patiala and the states of East Punjab States Union.
The States Reorganisation Act of 1956 was the most extensive change in state boundaries since independence. It led to the creation of 14 states and union territories. The states of Travancore and Cochin were merged to form Kerala. Telegu speaking regions in Hyderabad were merged into Andhra Pradhesh. Patiala and East Punjab States Union were merged to form Punjab. The states of Saurashtra, Kutch, and other Marathi speaking districts were merged to form Bombay. Along linguistic lines, similar exercises were undertaken to form the states and union territories of India.