Answer:
D.

Explanation:
Given,
Number of adults who drank iced tea = 42,
Bottled water = 24,
And, Lemonde = 36,
Thus, the total number of adults who drank either water or lemonade = 24 + 36 = 60
Hence, the ratio of adults who drank drank iced tea and who drank either water or lemonade


Since, the HCF(42,60) = 6,


Option 'D' is correct.