Statement I know nothing except the fact of my ignorance.,,
Conclusions
I. Writer 's knowledge is very poor.
II. The world of knowledge is too vast to be explored by a single person.

Statement I know nothing except the fact of my ignorance.,,
Conclusions
I. Writer 's knowledge is very poor. - Writer's knowledge can not be judged by the given statement.
II. The world of knowledge is too vast to be explored by a single person. - It is a quote given by the Greek philosopher Socrates which implies that knowledge of world is too vast to be explored by a single person.

So, the answer would be option b)if Conclusion II follows