Why the cost of wind power is dropped by 80% in the last 20 years?

1.	Why the cost of wind power is dropped by 80% in the last 20 years?
A.	Due to the efficiency of bigger turbines
B.	Due to New technology
C.	Due to Technological advancement
D.	Due to use to cheap material for the manufacturing of technology
Answer» B. Due to New technology

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Why the cost of wind power is dropped by 80% in the last 20 years?

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