Discussion
In the displacement method of structural analysis, the basic unknowns are:
Answer: C
In the displacement method the basic unknowns are Displacement and rotations.
The displacement (stiffness) method, used in slope-deflection, moment distribution and the matrix stiffness method, takes the joint displacements and rotations as unknowns. Equilibrium equations at the joints are written in terms of them, and member forces are found afterwards.
The force (flexibility) method is the counterpart that takes forces or redundant reactions as unknowns, so options involving forces or moments describe that method instead.
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