If the Variance of U Is Quadratic in X, Then $\theta _ { 0 } ^ { 2 }$

Multiple Choice

If the variance of u is quadratic in X, then it can be expressed as

A) var(u_i|X_i) = $\theta _ { 0 } ^ { 2 }$
B) var(u_i|X_i) = ?₀ + ?₁ $x _ { i } ^ { 1 / 2 }$
C) var(u_i|X_i) = ?₀ + ?₁ $x _ { i } ^ { 2 }$
D) var(u_i|X_i) = $\sigma _ { \mathrm { u } } ^ { 2 }$