✓ Correct! "x as a function of y" reverses the usual roles: every y must have exactly one matching x — i.e., y-values must be unique.

Table A: y-values 4, 1, 0, 1, 4 — y = 1 and y = 4 each repeat (with different x's). Not a function of y. ✗
Table B: y-values 1, 2, 3, 4, 5 — all unique. Yes, x IS a function of y. ✓ (Repeated x = 0 means y is not a function of x — but that's irrelevant here.)
Table C: y-values 2, 4, 6, 8, 10 — all unique. Yes, x IS a function of y. ✓ (In fact, both directions are functions — bijection.)
Table D: y-values 3, 5, 3, 7, 8 — y = 3 repeats. Not a function of y. ✗

Only B and C qualify.

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