This question places Katya in the second shift on Tuesday, and asks what could be true.
In question 15, we drew a scenario where Katia was second on Tuesday:
Hakeem and Joe are interchangeable between the shifts on Monday, and between Wednesday and Thursday.
Let’s look through the answers and see if any of them can be true. B is CORRECT. Hakeem can work the first shift on Monday in this diagram.
None of the other answers are possible in the diagram. And if you’re sure that the diagram you drew is right, then that’s the end of it. No need to conclusively disprove the other answers.
(Though it can be a helpful exercise to practice doing quickly, on review.)
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