When romeo meets juliet, what does he not know?
a ; he does not know she is poor.
b ; he does not know she is a montague.
c ; he does not know she is a capulet.
d ; he does not know she is angry with him.

 - -C ; He does not know she is a Capulet.

"She is a Capulet" meaning that she knows what is right for Juliet.
~In this case is was mostly involving marriage, and how he needed to wait to ask her.
Because of a so called man named count pairs, whatever they said or did regarding the marriage, it reflected back on him.
The marriage needed to be consent, meaning agreeable and having permission to do so.

Making this answer, C.