Power
is transmitted over transmission lines on high voltage, because :
Current
is reduced
Efficiency
is increased
Conductor cost is reduced
Both conductor cost is reduced and efficiency is increased
Both conductor cost is reduced and efficiency is increased
Power is transmitted over transmission lines on high voltage, because both conductor cost is reduced and efficiency is increased.
We
increases voltage then power loss decreases due to 
Volume
of required wire
.
So,
cost of conductor also reduced by increasing voltage.
Hence,
the correct option is (D).
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