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".
I would go with,
The stories time period
The characters environment
And where the story takes place
Or if it is an autobiography, then you can also look at where the author is from! I hope this helps!
The antonym would be freeze.
Objective: Us
hope this helps! (:
