Answer:
Symbolism
Step-by-step explanation:
Symbolism, as a figurative language, invests objects, traits, colors, animals, etc. with a symbolic meaning that is different from their actual form. In the excerpt, the black box aims to represent another concept, perhaps, it represents how things or beings become old, weary or less attractive with the passage of time.
The other options are incorrect because the passage does not make any comparison (metaphor or simile), and there are no objects nor animals with human attributes (personification).