Correct answer: (B) Sag correction is always negative.
Explanation
A suspended tape follows a curved path longer than the straight span. Correcting the observed length to the straight distance therefore subtracts sag: $C_s=-w^2L^3/(24P^2)$. Slope and misalignment also shorten the inferred horizontal/direct distance, while temperature correction changes sign with temperature difference. Thus **B**.
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