The figure shows the emission spectra recorded for three different light sources a, b and c using a spectrometer (note that the intensities are not to scale). Select the most appropriate statement regarding the identity of the source.

• Correct answer
  A

  a: Blue LED, b: Incandescent bulb, and c: Atomic Hydrogen gas.
• B

  a: Incandescent bulb, b: Blue LED, and c: Atomic Hydrogen gas .
• C

  a: Atomic Hydrogen gas, b: Blue LED, and c: Incandescent bulb.
• D

  a: Blue LED, b: Atomic Hydrogen gas, and c: Incandescent bulb.

Hence, the correct answer is option: 'A'.