Why did Charles Keeling choose to install an atmospheric carbon dioxide monitoring system on Mauna Loa, a volcanic peak on the Big Island of Hawaii?
A) The remote location would allow only carbon dioxide that had mixed with the atmosphere to be measured.
B) The peak is high enough to reach into the upper levels of the atmosphere where carbon dioxide concentrates.
C) He wanted to better understand the impact volcanoes have on atmospheric carbon dioxide.
D) The inaccessibility of the location would ensure that his instruments would not be tampered with.
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