To reach his goal, how many more chords does he need to learn?

To answer this question, we need to know how many chords Manuel has already learned. Since this information isn’t provided, we can only speculate. However, if we assume Manuel hasn’t learned any chords yet, then he needs to learn all 12.

But if you want the answer based only on the possible options given (and without specific numbers of chords learned), I’d suggest phrasing your question with the total he has learned to clarify. Otherwise, it cannot be precisely answered based on the information available.

Please clarify how many chords Manuel has learned, and I can help you determine how many more he needs to learn!