Phil Rupp's Sister Ethel Has the Utility Function U(x, Y)

Phil Rupp's sister Ethel has the utility function U(x, y) = min{ 4x + y, 5y}. Where x is measured on the horizontal axis and y on the vertical axis, her indifference curves consist of a

A) vertical line segment and a horizontal line segment which meet in a kink along the line y = 4x.
B) vertical line segment and a horizontal line segment which meet in a kink along the line x = 4y.
C) horizontal line segment and a negatively sloped line segment which meet in a kink along the line x = y.
D) positively sloped line segment and a negatively sloped line segment which meet along the line x = y.
E) horizontal line segment and a positively sloped line segment which meet in a kink along the line x = 4y.

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