Discussion
Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that:
Answer: A
Correct answer: A → B.
A functional dependency holds when each value of the determinant is always paired with one and the same value of the dependent attribute. Here A always brings the same B, so A determines B; but A appears with different values of C, so A does not determine C, and it cannot determine the pair (B, C) either. The last option reverses the direction, for which the data give no evidence.
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