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In constructing the weak forms of plane elasticity problems, which option is not related to the principle of virtual displacements?

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In constructing the weak forms of plane elasticity problems, which option is not related to the principle of virtual displacements?

(a) Displacements to strains

(b) Strains to stresses

(c) The equations of motion

(d) Body forces

This question was posed to me in an international level competition.

The origin of the question is Plane Elasticity in division Plane Elasticity of Finite Element Method

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Correct option is (d) Body forces

Easiest explanation: Among the ways of constructing the weak forms and associated finite element model of the plane elasticity equations, the principle of virtual displacements (or the principle of minimum total potential energy) is expressed in terms of matrices relating displacements to strains, strains to stresses, and the equations of motion. This approach is used in most finite element texts on solid mechanics.

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