Correct Answer: Fourth Five-Year Plan

Solution : The correct answer is (b) Fourth Five-Year Plan.

The Fourth Five-Year Plan in India, implemented from 1969 to 1974, emphasized the development of heavy industries. This plan was formulated with the goal of achieving rapid industrialization and reducing the country's reliance on imports.

During the Fourth Five-Year Plan, significant attention and resources were dedicated to the growth and expansion of heavy industries in sectors such as steel, chemicals, machinery, and power generation. The plan aimed to establish a strong industrial base, promote import substitution, and enhance self-sufficiency in critical sectors.