Choose the correct option by making hypothesis based on given assertion and reason. Give an explanation

Choose the correct option by making hypothesis based on given assertion and reason. Give an explanation.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true and R is not the correct explanation of A.
c) A is true but R is false.
d) Both A and R are false.
e) A is false but R is true.

Assertion (A) : Blue colour of sky appears due to scattering of light.
a) Reason ® : Blue colour has shortest wavelength among all colours.

a) Both A and R are true and R is the correct explanation of A.