In the context of India's Five-Year Plans, a shift in the pattern of industrialization, with lower emphasis on heavy industries and more on infrastructure begins in:

Correct Option (b):

The Sixth Five Year Plan (1980-1985) marked a significant reorientation in India's industrialization strategy. This plan moved away from the earlier predominant emphasis on heavy industries towards a more balanced approach. It placed increased importance on infrastructure development, employment generation, poverty alleviation, and investments in sectors like energy and transport. While elements of import substitution persisted, there was also an emerging inclination towards economic reforms. This period thus represents the beginning of a shift in the pattern of industrialization with lower emphasis on heavy industries and more on infrastructure.

Incorrect Options:

• Fourth Plan (1969-1974): This plan largely maintained the focus on heavy industries and witnessed significant nationalization initiatives, rather than a shift away from heavy industries.
• Eighth Plan (1992-1997): This plan was formulated in the aftermath of economic liberalization and focused on deeper structural reforms. However, the initial shift in the pattern of industrialization, as described in the question, predates this period.
• Tenth Plan (2002-2007): This plan emphasized inclusive growth, poverty reduction, and improving the quality of governance. The fundamental shift in industrialization strategy, as inquired, had already taken place in earlier plans.