'The Queen of Herbs' is the most sacred herb of India. This medicinal plant…

Concept: Every plant carries a two-part scientific (binomial) name -- genus followed by species -- assigned under international botanical nomenclature; the species epithet often preserves a clue about the plant's traditional or cultural significance (for example, 'sanctum' means 'sacred').

Application: The question gives two clues -- 'Queen of Herbs' revered in Hindu mythology, and the name Ocimum sanctum. Ocimum is the basil genus, and sanctum ('sacred') is the long-used name for the one basil variety worshipped in Indian homes -- Tulsi (Holy Basil), grown in a tulsi vrindavan and offered in daily puja (the plant is now formally classified as Ocimum tenuiflorum, with sanctum retained as its widely recognised synonym).

Cross-check: None of the remaining offered herbs belong to the genus Ocimum or carry any comparable sacred-plant reputation:

Result: The plant described is Tulsi (Ocimum sanctum / Ocimum tenuiflorum).