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In the simple bending theory one of the assumptions usually made is that the plane sections before bending remain plane after bending. This assumption implies that

[A].	Stress is uniform in the beam cross-section	[B].	Stress is uniform in the beam cross section
[C].	Stress is proportional to the distance from the neutral axis	[D].	Strain is proportional to the distance from the neutral axis
[E].	Stress is proportional to strain at all section

Answer: Option D

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