Answer:
B.) Who
Explanation:
The curator of the art museum, who gave a speech last night, will be attending tonight's ceremonies, as well.
The term "that" is a less formal way to put it. And using the term "which" does not make grammatical sense, so your best choice would be "who".
It allows the reader to see how the character came to be who he or she is currently, it creates realism in the text, it creates tension between the narrator and the character, etc.
It can be
1+1=2
0+2=2
or some of these kind of pairs.
Hope that this all helps you!=)
U use it when u are talking about a noun
