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A: Option A would still show nonzero displacements if the case solved, Option B would reduce but not fully eliminate deflection under bending, Option D distorts magnitude but doesn't force zero movement, Option C locks degrees of freedom through coincident nodes so reactions appear without visible deformation.

A: Option A inflates response without fixing the load path, Option B hides behaviour behind mesh density, Option C still bypasses realistic stiffness spread, Option D restores the correct vertical load distribution mechanism before assessing demand.

A: Option A uses results to justify inputs, Option B delays a prerequisite check until too late, Option D answers a different risk, Option C verifies directionality and magnitude against expected service behaviour.

A: Option A affects demand globally, Option B shifts stiffness not stability mode checks, Option D changes combination severity, Option C suppresses the critical instability check that drives the real failure.