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Foci at (0, 4) and (0, -4) with focal sum 10 give the ellipse
Ax²/25 + y²/9 = 1
Bx²/9 + y²/25 = 1
Cx²/25 + y²/16 = 1
Dx²/9 + y²/16 = 1
Answer & Solution
Correct answer: B. x²/9 + y²/25 = 1
The foci lie on the y-axis, so the major axis is vertical with a = 5, c = 4, b² = 9: x²/9 + y²/25 = 1.
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