Answer:
C) both
Step-by-step explanation:
Lewis base -
Lewis base , are the species that have more electron density hence can easily donate its electron density .
The simple indication to determine , whether a species is a Lewis base or not is to look for negative charge or lone pairs of electrons ,
The species having negative charge or lone pairs of electrons , in maximum case , are Lewis bases .
Therefore from the question ,
ammonia and water both are Lewis bases .
Because both the species have lone pair of electrons , hence have more electron density and can easily donate its electron density .