The refractive index of fluid A is 1.47. What does this mean?

Question

The refractive index of fluid A is 1.47. What does this mean? — Exam MCQ

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C. Its light speed is reduced by a factor of 1.47 relative to vacuum — n = c/v = 1.47, so v = c/1.47.

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A. Its light speed is 1.47 times greater than in air

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B. Its light speed is 1.47 times greater than in water

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D. Its light speed is increased 1.47 times relative to water