Three doctors — X, Y, Z — are assigned to three shifts: morning, afternoon, evening. X does not work morning. Y works the shift immediately before Z. What is the assignment?

✓ Correct Answer: Option B

Y immediately before Z: Y=morning→Z=afternoon, or Y=afternoon→Z=evening. X not morning. If Y=morning, Z=afternoon, X=evening ✓. If Y=afternoon, Z=evening, X=morning ✗. Only first works.