The passage below (paragraphs 10-11) mainly shows that .
Turbines are designed so that they don’t need constant maintenance, for the simple reason that there are a lot of them and they’re a pain to climb.
Some windmills can run for a long time without human intervention. The Gedser Wind Turbine in Denmark was installed in the late 1950s, and generated power for 11 years without maintenance. Modern turbines are typically rated to run for 30,000 hours (three years) without servicing, and there are no doubt some that would run for decades.
Answer choices for the above question
A. turbines need less maintenance than other power sources and some would last decades
B. the Gedser Wind Turbine in Denmark would provide artificial light longer than any other source on Earth
C. turbines are difficult to climb and so the presence of light could never truly be proven
D. turbines would turn off instantly because wind would end when humans left Earth