A SALT IS OBTAINED AS A REACTION BETWEEN
A SALT (and water) IS OBTAINED AS A REACTION BETWEEN a base and an acid. See:
http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/acidbase.html
http://lrs.ed.uiuc.edu/students/erlinger/water/background/ph.html
I hope this helps. Thanks for asking.
im taking the same test the aswer is D. a base and an acid