Why may effective-length factors disagree between two nominally identical columns participating in different brace bays?

Choices

• (A) Adjacent braced bays supply unequal storey stability indices altering K‑factors
• (B) Diagonal braces impose identical storey stiffness on every grid line mechanically
• (C) Alignment charts ignore sway whether braces exist or not
• (D) Column K always equals unity for interior frames arbitrarily