Concept:The phrase “Unity in Diversity” was coined by Jawaharlal Nehru to describe India’s ability to remain united despite its vast diversity in languages, religions, castes, and cultures.Explanation:Jawaharlal Nehru, the first Prime Minister of independent India, popularized this phrase in his famous book ‘The Discovery of India’.He used it to highlight how Indians from different backgrounds share a deep sense of national unity.Nehru was a key leader of the freedom struggle and also a founder of the Non-Aligned Movement.His other notable works include ‘Glimpses of World History’.Answer:B. Jawahar Lal Nehru