What Factor Has Seriously Reduced the Effectiveness of the Telescopes

What factor has seriously reduced the effectiveness of the telescopes around the world, such as those at Mt. Palomar in California and at Kitt Peak, near Tucson, Arizona, over the last few years?

A) tarnishing of the mirror surface by air pollution
B) cracking of the mirror by earthquakes
C) bending of the mirror surface from repeated exposure to the cold night air
D) light scattering in the atmosphere from nearby cities

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