Discussion
The fundamental period of a building is most sensitive to
Answer: A
Correct answer: its mass and lateral stiffness
The period is \( 2\pi\sqrt{m/k} \), so mass and lateral stiffness are the only quantities that enter it.
Everything that matters does so through one of them: height and framing through the stiffness, floor construction and imposed load through the mass. The concrete grade in the slabs affects the period only through the small change it makes to the frame's stiffness, and finishes and occupants affect it only as mass - the option naming both parameters directly is the answer.
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