Respuesta :

A Lewis base is characterized as any species that can donate a lone pair of electrons the Lewis acid (which has a vacant orbital for the lone pair to bond with)
If your answers/question are these:

Which is a characteristic of a Lewis base?
It behaves as the electron donor.It behaves as the electron acceptor.It donates a hydrogen ion to other compounds.It increases the concentration of hydrogen ions.

Then the answer is: A
it was for me at least so i hope this helps