17. The figure shows the direction of the current through three inductors. Here are the currents as a function of time t: i₁ = 5t； i₂ = 5t； i₃ = 5/t. In which inductor is the induced emf upward in the figure?

(A) 2 and 3,
(B) 1 and 3,
(C) 3 only,
(D) all three,
(E) none.

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