I believe it is C. Allusion.
Answer:
The excerpt presented allows readers to approach a “forbidden door".
Explanation:
In "Danse Macabre", Stephen King describes how society influences the horror genre. Be it in books, comics, films, etc. He explores the history of the genre and how real life situations are the consequence of that history.
In this case, King is pointing us to a "forbidden door".
"(...) he peered into the darkness."
"(...) he could resolve this mystery. He swung his legs to the floor with conviction."
The character is going into the darnkess to solve that mistery. He is going to cross that "forbidden door".
Answer:
Politely
Explanation:
The answer is politely because adverbs of manner show how something was done.
I believe it is D. Just from context
Well, using my limited knowledge, "cleaving" means to chop, break in half, split, etc. Twain means twice. So, perhaps it's like "you've broke my heart in half", something along those lines? hopefully this helps you.