根据《地规》附录 U.0.2 条

$$ b _ {\mathrm{y} 0} = \left[ 1 - 0. 5 \frac {h _ {1}}{h _ {0}} \left(1 - \frac {b _ {\mathrm{y} 2}}{b _ {\mathrm{y} 1}}\right) \right] b _ {\mathrm{y} 1} = \left[ 1 - 0. 5 \times \frac {2 0 0}{9 3 0} \times \left(1 - \frac {1 0 0 0}{2 0 0 0}\right) \right] \times 2 0 0 0 = 1 8 9 2 \mathrm{mm} $$

根据《地规》第8.2.9条

$$ \beta_ {\mathrm{hs}} = \left(\frac {8 0 0}{h _ {0}}\right) ^ {\frac {1}{4}} = \left(\frac {8 0 0}{9 3 0}\right) ^ {\frac {1}{4}} = 0. 9 6 3 $$

$$ V _ {\mathrm{s}} \leq 0. 7 \beta_ {\mathrm{hs}} f _ {\mathrm{t}} A _ {0} = 0. 7 \times 0. 9 6 3 \times 1. 4 3 \times 9 3 0 \times 1 8 9 2 = 1 6 9 6 \mathrm{kN} $$

因此选（A）。