Correct Option: B

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.