Which period in India is described as Plan Holiday?

Correct option is B

The correct answer is (b) 1966 to 1969
The period described as "Plan Holiday" in India was from 1966 to 1969. This term refers to a three-year hiatus between the third and fourth Five-Year Plans. The Indian government took this break primarily due to severe economic difficulties, including a shortfall in food production, inflation, and the impact of wars with China and Pakistan. Instead of launching a new Five-Year Plan immediately after the third, the government introduced annual plans to stabilize the economy.