Who owns the book on subject U?
C
We are told that the book on subject U is neither owned by B nor A, and that D's book is at the bottom of the stack. Thus, D must own the book on subject U. All the conditions point to D as the correct answer.
Thus, the correct answer is (c) D.
Four teams – Red (R), Blue (B), Green (G), and Yellow (Y) – are competing in the final four rounds of the Inter-School Science Olympiad, labeled Round A, Round B, Round C, and Round D. Each round consists of one match between two teams, and every team plays exactly two matches. No team plays the same opponent more than once.
The final schedule must adhere to the following rules:
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