A Spectroscopic instrument can resolve two nearby wavelength \[\lambda \] and \[\lambda +\Delta \lambda \]if \[\lambda /\Delta \lambda \] is smaller than 8000. This is used to study the spectral lines of the Balmer series of hydrogen. Approximately how many lines will be resolved by the instrument?

• A.  60
• B.  43   
• C.  38
• D.  21