Concept:Identification of the largest flower among the given options.Explanation:We need to know which of the given flowers is the largest in the world.Rafflesia arnoldii produces the largest individual flower on Earth, which can be more than three feet across.Lotus, Passiflora, and Sunflower are also notable flowers, but none of them produce flowers as large as Rafflesia.Therefore, Rafflesia is known for having the largest flower.Answer:C. Rafflesia