Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives a polysubstituted product.
Reason (R): Acyl group sterically hinders the approach of further acyl groups.
 
1. Both (A) and (R) are true, and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True, but (R) is False.
4. (A) is False, but (R) is True.