Correct Option: C

The Rolling plan concept in National planning was introduced by the Janata Party government. Fifth FYP was launched and planned for period 1974-79 but Janata government came in power in 1978 and ended the plan prematurely in 1978. The Janata government launched sixth FYP for period 1978-1983. Congress government when came in power in 1980 abandoned the sixth FYP and launched a new sixth FYP for period 1980-1985. The plan for period, 1978-80, is called the rolling plan.