Eery, spooky, quiet, silent, daunting, bristling, creaking
It could be the first or the third answer but i am not sure you probably have to look up the words to find what it could be
Mark Twain wants to add religious overtones (b)
Because St. Bernard is a dog but has a slightly religious name and a Presbyterian is a dog but also a British church.
Hope it helped,
Happy homework/ study/ exam!