What is a word that start with the prefix fort

Which three parts of these excerpts reflect the idea that war affects not only the minds of the combatants but also their physical reactions?

What can you infer about gregor from this excerpt? a. he is ungrateful and refuses to eat all of the food that grete brings for him b. his appetite is good, which shows that his body is trying to return to human form c. he always eats trash, and grete is trying to get him to remember being human d. his eating habits are changing, and he is becoming physically less human

Which is not among the style choices a writer would use, if he or she is trying to establish a formal writing style/