Optical fibre are used for long distance communication because

it amplifies signals to be transmitted

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it transfer signals faster than electrical cables

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it pre-emphasise weak signals

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it provide little attenuation as compared to electrical cable for light propagation

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Solution

The correct option is C it provide little attenuation as compared to electrical cable for light propagation
They permit transmission over longer distances and at higher bandwidths (data rates) than wire cables. Fibers are used instead of metal wires because signals travel along them with lesser amounts of loss; in addition, fibers are also immune to electromagnetic interference, a problem from which metal wires suffer excessively.

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