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Observers in the nineteenth century reported seeing many straight-line features criss-crossing the ...

Observers in the nineteenth century reported seeing many straight-line features criss-crossing the surface of Mars and interpreted these to be canals constructed by intelligent beings. What is the most likely present-day explanation for these observations?
A)   They were rifts in the Martian surface at the boundaries of geological tectonic plates.
B)   They were linear, stationary cloud formations (mountain lee wave clouds) and weather fronts moving around with the planet.
C)   They were optical illusions caused by vague shadings on the planet's surface.
D)   They were lines of dark volcanoes similar to those of the Hawaiian Islands on the Earth.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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