The characteristics of a base include:
- a accepts protons (this is characteristic of bases in Brønsted-Lowry theory)
- c feels slippery (many bases, like soap, feel slippery)
- d tastes sour (this characteristic is typical of acids, not bases)
Out of the options provided, the correct characteristics of a base are:
a accepts protons and c feels slippery.
If you are looking for a single best answer characteristic of a base from the options given, it would be c feels slippery.