Ans: D.Nagaland-Haryana-Sikkim-Arunachal Pradesh

Exp: Nagaland on 1^st December 1963.
Haryana on 1^st November 1966.
Sikkim on 16^th May 1975.
Arunachal Pradesh on 20^th Feb 1987.

State Formation in Chronological Order

State Formation in Chronological Order
1953: Andhra Pradesh carved out of Madras
1960: Gujarat separated out of Bombay(15th State)
1963: Nagaland separated out of Assam(16th State)
1966: Haryana separated out of Punjab(17th State) HP separated as UT
1971: HP converted into state from UT(18th state)
1972: Manipur converted to state from UT(19th)
1972: Tripura converted to state from UT(20th)
1972: Meghalaya converted to state from sub state in Assam(21st)
1975: Sikkim from being a protectorate of India became a full state(22nd)
1987: Mizoram converted to state from UT(23rd)
1987: Arunanchal converted to state from UT(24th)
1987: Goa converted to state from UT(25th)
2000: Chhatisgarh (26th)
2000: Uttarakhand (27th)
2000: Jharkhand (28th)