TOEFL Reading: ETS-TOEFL阅读机经 - 60DA_03N5KCFN71CL$

Why does the author mention that "Most climate modeling grids fail to take into account common-sized cloud formations"? A. To suggest why the influence of clouds on climate change is still undetermined B. To explain why research on climate change does not focus on clouds C. To help explain why it is unclear whether aerosols have the effect of counteracting warming D. To explain in part why scientists are uncertain how much incoming radiation is absorbed or reflected