Given below are two statements: One is labeled as Assertion A and the other is labeled as Reason R
Assertion A: Diffusion current in a $p-n$ junction is greater than the drift current in magnitude if the junction is forward biased.
Reason R: Diffusion current in a $p-n$ junction is from the $n-$ side to the $p-$ side if the junction is forward biased.
In the light of the above statements, choose the most appropriate answer from the options given below.