The period of the second five-year plan in India was:

1956-61

The correct answer is Option 3- 1956-61

The period of the Second Five Year Plan in India was 1956-61.

The Second Five Year Plan was launched in 1956, and it focused on rapid industrialization and economic growth. The plan also emphasized the development of infrastructure, such as roads, railways, and irrigation systems.

The Second Five Year Plan was a success, and it helped to lay the foundation for India's future economic growth. The plan achieved most of its targets, and it helped to increase India's GDP by 4.25% annually.

The Second Five Year Plan was a significant event in Indian history. It helped to transform India from an agricultural economy into an industrial economy. It also helped to improve the lives of millions of Indians by providing them with access to education, healthcare, and other essential services.