Gothic literature refers to the type of literature that usually combine horror and romance. This type of literature has been in existence for long and is still very much relevant today. Example of Gothic works are: Dracula, Castle of Otranto and Frankenstein. The first four chapters of the book Frankenstein showcase the the supernatural aspect of Gothic literature.
Using the context clues in the sentence. You can accurately determine the meaning of the word onerous. The sentence starts off with stating a 10 - page research project. That would most likely be tedious and hard. So the best answer choice is answer C. Difficult