Given below are two statements : one is labeled as Assertion (A) and the other is labeled as Reason (R). 
Assertion (A) : $\mathrm{\alpha }$ - halocarboxylic acid on reaction with dil NH₃ gives good yield of $\mathrm{\alpha }$ -amino Carboxylic acid whereas the yield of amines is very low when prepared from alkyl halides. 
Reason (R): Amino acids exist in zwitter ion form in aqueous medium. In the light of the above statements, choose the correct answer from the options given below: