Discussion
Entrainment and mixing can broaden a droplet spectrum because
Answer: A
Correct answer: different parcels experience different histories of growth
Entrainment brings drier air in through the cloud edges, and the mixing that follows is inhomogeneous: some droplets evaporate entirely while others in less diluted parcels continue growing. Different parts of the cloud therefore carry droplets with different growth histories, and when those parcels mix the resulting spectrum is far broader than adiabatic condensation alone would produce - which helps close the gap in the previous item.
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