One difficulty in evaluating the effectiveness of cloud seeding is
A) it is impossible to determine the presence of updrafts in the region of a precipitating cloud
B) it is impossible to determine the temperature in the region of a precipitating cloud
C) it is impossible to determine the stability in the region of a precipitating cloud
D) it is impossible to determine whether a seeded cloud would have produced precipitation even if it were not seeded
Answer: D
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A. Likely B. Unlikely