When We Teach Someone What a Concept Means by Pointing

When we teach someone what a concept means by pointing out a physical example and saying, "things like that," we are providing an ostensive definition, rather than a logical one.Is it possible to provide an ostensive definition for every concept?

A) Yes, because every concept has physical examples.
B) Yes, because that is how we all learned the language as babies.
C) Yes, because everything with a logical definition also has an ostensive one.
D) No, because people won't know whether we are pointing at the thing or its color.
E) No, because some concepts do not have physical examples at which to point.