Answer:
b. was aware of his ignorance.
Explanation:
When the Delphi Oracle pronounced Socrates to be the wisest of people, Socrates thought the pronouncement referred to the fact that he was aware of his ignorance. According to Socrates, it takes a wise man to be aware and acknowledge his ignorance, hence when the Delphi Oracle pronounced him as the wisest of people, he took this to mean that he was aware of his ignorance and must continually continue to strive for truth.