3. Consider the Lennard-Jones potential energy U(r) = 4ε[(σ/r)¹² − (σ/r)⁶], where σ and ε are constants and r is the distance between two particles. At which distance r is the attractive force largest?
(A) r = σ
(B) r = 2^1/6σ
(C) r = 0
(D) r = (26/7)^1/6σ
(E) r = (26/7)^1/6ε/σ.

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