Final answer:
The phrase 'hit my heart with the force of a nuclear bomb' uses a metaphor, a literary device that makes a direct comparison between two unlike things. The correct option is B.
Step-by-step explanation:
The literary device used in the phrase "hit my heart with the force of a nuclear bomb" is a metaphor. A metaphor is a figure of speech that directly compares two unlike things without using the words 'like' or 'as,' which would constitute a simile. This phrase is a metaphor because it is equating the emotional impact felt in the heart to the immense force of a nuclear bomb, without using 'like' or 'as' to make the comparison. Metaphors are effective because they create a vivid image and can convey complex emotions and concepts in a concise way. They help readers to understand and feel the intensity or the subtlety of the writer's ideas by linking the familiar to the unfamiliar.
Repetition is a different literary device that involves the deliberate use of the same word, phrase, line, or sentence more than once, to emphasize an idea or a theme. However, there is no indication of repetition in this specific phrase, as it does not repeat any words or ideas multiple times. Likewise, personification is not applicable here, as the phrase does not attribute human qualities to inanimate objects or abstract notions.