A rule states that in order to drink beer one must be over 1

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A rule states that in order to drink beer one must be over 18 years old. In a bar, there are 4 people. P is 16 years old, Q is 25 years old, R is drinking milkshake and S is drinking beer. What must be checked to ensure that the rule is being followed?

[GATE EC 2017 Set 2]

A Only P's drink

B Only P's drink and S's age

C Only S's age

D Only P's drink, Q's drink and S's age