Given the value of Rydberg constant is ${10}^7{m}^{-1},$ the wave number of the last line of the Balmer series in hydrogen spectrum will be

• A

  $0.25\times {10}^7{ \mathrm{m}}^{-1}$

• B

  $2.5\times {10}^7{ \mathrm{m}}^{-1}$

• C

  $0.025\times {10}^4{ \mathrm{m}}^{-1}$

• D

  $0.5\times {10}^7{ \mathrm{m}}^{-1}$