Correct option is B
When a structural member is strained due to external imposed loads, the energy stored is called strain energy. Strain energy refers to the energy absorbed by a material when it is deformed within its elastic limit, which is the correct answer (b).
Key points about the other options:
Yield point: This is the point on a stress-strain curve where the material starts to deform plastically, beyond the elastic limit.
Elastic limit: This is the maximum stress a material can withstand before permanent deformation occurs.
Endurance limit: This is the maximum alternating stress a material can withstand without failing due to fatigue.
