The correct answer is: No article.
The word “university” is a countable noun, which means it can be preceded by a definite article (the) or an indefinite article (a or an). However, in this case, the word “university” is used in a general sense, not a specific sense. This means that it is not necessary to use an article.
For example, if you were talking about a specific university, such as Harvard University, you would use the definite article: “He hopes to join Harvard University soon.” However, if you are talking about universities in general, you would not use an article: “He hopes to join a university soon.”
In this case, the speaker is not referring to a specific university, but rather to the idea of going to university in general. Therefore, the use of an article would be incorrect.