If the radius of the $3^{\text{rd}}$ Bohr's orbit of hydrogen atom is $r_{3}$ and the radius of $4^{\text{th}}$ Bohr's orbit is $r_{4}$,then which of the following relations is correct?
- A$r_{4} = \frac{9}{16} r_{3}$
- B$r_{4} = \frac{16}{9} r_{3}$
- C$r_{4} = \frac{3}{4} r_{3}$
- D$r_{4} = \frac{4}{3} r_{3}$
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