16. Let T : be a function. Which of the following defines a linear transformation?
(A) T(a₁, a2) = (1, a1)
(B) T(a₁, a₂) = (a₁, a₂)
(C) T(a₁,a₂) = (a₁ + 1, a₂)
(D) T(a₁,a₂) = (a₁ cosθ-a2sinθ, a₁ sinθ+a₂cos θ),   for a fixed angle θ

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