Based on the experiment in the figure above, which of the following are plausible reasons for the result?
I) No nutrients evaporate now that vegetation is absent.
II) Nutrients dissolve in the water running through the watershed.
III) Nutrients are attached to small particles of sand or clay that leave the watershed.
IV) Plant roots that held soil particles in place are no longer there.
A) only I and III
B) only II and IV
C) only I, II, and IV
D) only II, III, and IV
E) only I, II, and III
Answer: D
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