Wilma Q Has a Utility Function U(x₁, X₂) = X²₁

Wilma Q. has a utility function U(x₁, x₂) = x²₁ + 1.5x₁x₂ + 30x₂. The prices are p₁ = $1 and p₂ = $1. For incomes between $20 and $60, the Engel curve for good 2 is

A) upward sloping.
B) downward sloping.
C) vertical.
D) upward sloping for incomes between $20 and $40 and downward sloping between $40 and $60.
E) downward sloping for incomes between $20 and $40 and upward sloping between $40 and $60.

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