Planck's constant $(h),$ speed of light in vacuum $(c)$ and Newton's gravitational constant $(G)$ are three fundamental constants. Which of the following combinations of these has the dimension of length $?$
  • A$\sqrt {\frac{{hc}}{G}} $
  • B$\;\sqrt {\frac{{Gc}}{{{h^{\frac{3}{2}}}}}} $
  • C$\frac{{\sqrt {hG} }}{{{c^{\frac{3}{2}}}}}$
  • D$\;\frac{{\sqrt {hG} }}{{{c^{\frac{5}{2}}}}}$
NEET 2016, Diffcult
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