Answer
B) Bronstead bases.
Procedure
To explain the behavior of amines with water we will use the case of ammonia.
Ammonia is a weak base and takes a hydrogen ion from a water molecule to produce ammonium ions and hydroxide ions. However, the ammonia is only a weak base and doesn't hang on to the hydrogen ion very successfully.
The reaction is reversible, with the great majority of the ammonia at any one time present as free ammonia rather than ammonium ions. The presence of the hydroxide ions from this reaction makes the solution alkaline.
Amines are able to accept a hydrogen atom by donating a lone electron pair, making them a base in the Lewis definition and the Bronsted-Lowry definition of bases.