Read the passage. from the introduction to frankenstein night waned upon this talk, and even the witching hour had gone by, before we retired to rest. when i placed my head on my pillow, i did not sleep, nor could i be said to think. my imagination, unbidden, possessed and guided me, gifting the successive images that arose in my mind with a vividness far beyond the usual bounds of reverie. i saw—with shut eyes but acute mental vision—i saw the pale student of unhallowed arts kneeling beside the thing he had put together. i saw the hideous phantasm of a man stretched out, and then, on the working of some powerful engine, show signs of life and stir with an uneasy, half vital motion. which words in the passage create a dark mood? a. witching hour; pale student of unhallowed arts; hideous phantasm of a man b. my imagination, unbidden, possessed and guided me; bounds of reverie c. show signs of life; successive images; some powerful engine d. with shut eyes but acute mental vision; half vital motion