Solution:Ghanshyam Das Birla is considered as a doyen of Indian Industry. He was the most important pre-Independence contributor to the Indian National Congress.
Ambalal Sarabhai (1890-1967) was a leading industrialist of Ahmedabad and also played an important role in India’s freedom struggle. He was founder of Sarabhai Group of Companies, like Sarabhai Textiles, Calico Textile Mills, Sarabhai Chemicals and others.
Walchand Hirachand Doshi (23rd November, 1882-18th April, 1953) was an Indian industrialist, founder of Walchand Group of Companies. He established India’s first modern shipyard, first aircraft factory and first car factory besides having established construction companies, sugar plantation, sugar factory, confectionery, engineering companies and many other business.
Hence, option (b) is correct.