Jack is looking at Anne, but Anne is looking at George.
Jack is married, but George is not.
Is a married person looking at an unmarried person?
(A) Yes
(B) No
(C) Can not be determined
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The correct answer is (A) YES.
Why is this question so tricky? It is because it appears to give you insufficient information.
Anne's marital status is not known, nor can it be determined, and so you make the inference that the question posed cannot be determined.
In fact, Anne's marital status is irrelevant to the answer.
If she is married, then a married person is looking at an unmarried person (Anne is looking at George), and if she isn't, a married person is looking at an unmarried person (Jack is looking at Anne).
Written down it becomes more obvious. If '>' means 'looking at' then:
Jack > Anne > George, or
Married > Unknown > Unmarried
Replace Unkown with Married or with Unmarried and either way there is clearly a married person looking at an unmarried one.