Which passage from Frankenstein best illustrates the theme of "the danger of pushing beyond natural boundaries in science"?

A."Was there no injustice in this? Am I to be thought the only criminal, when all human kind sinned against me?" (329)

B."Do not return to your families with the stigma of disgrace marked on your brows. Return as heroes who have fought and conquered, and who know not what it is to turn their backs on the foe" (318).

C."I did right in refusing to create a companion for the first creature. He showed unparalleled malignity and selfishness in evil: he destroyed my friends; he devoted to destruction beings who possessed exquisite sensations . . ." (322).

D."You can blast my other passions; but revenge remains, — revenge, henceforth dearer than light or food! I may die: but first you, my tyrant and tormentor, shall curse the sun that gazes on your misery" (237)