Assertion: The blue colour of sky appears due to the scattering of blue colour.

Reason: Blue colour has the shortest wavelength in the visible spectrum.

 Option:

1)     Both assertion and reason are true and the reason is the correct explanation of assertion

2)     Both assertion and reason are true, but the reason is not the correct explanation of assertion

3)     If the assertion is true, but the reason is false

4)     If the assertion is false, but the reason is true