第1766题：极限计算
求以下左侧极限:
limh→0−h2+4h+3−3h\lim\limits_{h \to 0^-} \dfrac{\sqrt{h^2+4h+3}-\sqrt{3}}{h}h→0−limh√h2+4h+3−√3 .
A. 23\dfrac{2}{\sqrt{3}}√32
B. 33\dfrac{3}{\sqrt{3}}√33
C. 22\dfrac{2}{\sqrt{2}}√22
D. 32\dfrac{3}{\sqrt{2}}√23
