Question

figurative language: overview
what is synecdoche?
when a part is made to represent the whole
giving human traits to a nonhuman thing
an extreme exaggeration

Explanation:

Synecdoche is a figure of speech where a part of something is used to refer to the whole (or vice versa). The other options describe different figures of speech: giving human traits to nonhumans is personification, and extreme exaggeration is hyperbole. Thus, the correct definition is "when a part is made to represent the whole".

Answer:

when a part is made to represent the whole