A particle undergoes three successive displacements given by $s _1=\sqrt{2}\,m$ north-east, $s _2=2\,m$ due south and $s _3=4\,m , 30^{\circ}$ north of west, then magnitude of net displacement is
- A$\sqrt{14+4 \sqrt{3}}$
- B$\sqrt{14-4 \sqrt{3}}$
- C$\sqrt{4}$
- DNone of the above
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