$($Choose one$)$ When Socrates questions his and Meno's acceptance of the claim that virtue is knowledge, what is his principle reasoning for doing so$?$

If virtue is knowledge, then it should be teachable, but there do not appear to be any teachers.

If virtue is knowledge, then there should be virtuous people, but it is impossible to find any virtuous people.

People are either born virtuous or not, so knowledge is beside the point.