I would have to say black, because it just fits with most creepy books. Sorry if you can't figure out an explanation.
I'm pretty sure its A. were starting to think the cat had gotten your tongue
Well, after researching, The correct answer would be B. He is not entirely trustworthy.
Nationality would be the country a person was born in. Ethnicity would be their ethnic or racial background.
Example:
A person could be born in Canada and be Canadian but their ethnicity could be something like Chinese or African.