12. Given a particle with energy E in a finite potential U(x), as shown in Figure 2 (with regions I through V, where Region III has U ＞ E), what is the form of the particle's wavefunction in Region III?

(A) ce^κx, where κ ∈ ℝ
(B) cx²
(C) c₊e^κx+ c₋e^-κx, where κ ∈ ℝ
(D) ce^-κx, where κ ∈ ℝ
(E) c₊sin(kx) + c₋cos(kx), where k ∈ ℝ

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