Answer:
D). It suggests that food is necessary to fight disease.
Step-by-step explanation:
Metaphors are characterized as the literary device that is primarily employed to establish comparison between two distinct things in order to explain or elaborate the idea/concept more vividly by associating the similarities between them. In the given phrase, the metaphor of 'amunition' is employed to compare it with 'ammunition' in order to elaborate the idea that food functions to safeguard the body as the ammunition does to protect the target. Thus, option D is the correct answer.