Discussion
Assertion (A) : Li-fi can be used more effectively in a dense environment.
Reason (R) : Li-fi uses ultraviolate, infrared and visible light communication
Answer: A
Both (A) and (R) are true.
Li-Fi transmits data by rapidly modulating light. Light does not pass through walls and does not interfere with radio signals, so many Li-Fi cells can work close together without interfering, which makes it effective in dense environments such as offices, hospitals and aircraft cabins. So A is true.
R is also true: Li-Fi uses visible light, and also infrared and near-ultraviolet light, for communication. The paper spells ultraviolet as 'ultraviolate'. Since neither statement is false, the other three options are wrong.
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