Final answer:
The poem 'Happiness Epidemic' utilizes the poetic technique of conceit, which is an extended metaphor comparing the spread of happiness to an infectious disease. Therefore correct option is C
Step-by-step explanation:
The poetic technique illustrated throughout the entire poem "Happiness Epidemic" by David Hernandez is conceit. A conceit is an extended metaphor that draws a striking parallel between two seemingly disparate things. In this poem, the metaphor of a 'happiness epidemic' compares the spread of joy and cheerfulness to the spread of an infectious disease. The vivid and continuous comparison used in the poem helps to bring this concept to life by describing happiness as a condition, with associated symptoms and effects on people, which is akin to a physical illness but with positive connotations.