Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ : The diameter of colloidal particles in solution should not be much smaller than the wavelength of light to show Tyndall effect.
Reason $R$ : The light scatters in all directions when the size of particles is large enough.
In the light of the above statements,choose the correct answer from the options given below:

• A
  $A$ is true but $R$ is false
• B
  $A$ is false but $R$ is true
• C
  Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$
• D
  Both $A$ and $R$ are correct but $R$ is $NOT$ the correct explanation of $A$