Step 1: Cumulus Analysis (A)
Cumulus clouds, derived from the Latin for 'heap', appear puffy with flat bases. A corresponds to (III).
Step 2: Nimbus Analysis (B)
Nimbus, Latin for 'rain cloud', signifies precipitation. B matches (I).
Step 3: Cirrus Analysis (C)
Cirrus, meaning 'curl of hair' in Latin, describes high-altitude, thin, wispy clouds of ice crystals. C aligns with (IV).
Step 4: Stratus Analysis (D)
Stratus clouds, from the Latin for 'layer', are horizontal and layered. D matches (II).
Conclusion: The correct matches are A-III, B-I, C-IV, D-II.