![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
Mauna Loa is the standard for CO2 measurement for the reason that______.
A.
Hawaii has small concentrations of human
B.
its air has been polluted by Europe and North America
C.
Hawaii has far larger concentrations of humanity than other places
D.
The Arctic gets a lot of polluted air from Europe and North America