Answer: Option B
Answer: (b)
The Rolling plan concept in National planning was introduced by the Janata Party government. The fifth FYP was launched and planned for the period 1974–79 but the Janata government came in power in 1978 and ended the plan prematurely in 1978.
The Janata government launched the sixth FYP for the period 1978–1983. Congress government when came into power in 1980 abandoned the sixth FYP and launched a new sixth FYP for the period 1980–1985. The plan for the period, 1978–80, is called the rolling plan.