Apex
read this passage from "the city without us" by alan weisman:
the weeds are followed by the city's most prolific exotic species, the chinese ailanthus tree. even with 8 million people around, ailanthus—otherwise innocently known as the tree-of-heaven—are implacable invaders capable of rooting in tiny chinks in subway tunnels, unnoticed until their spreading leaf canopies start poking from sidewalk grates. with no one to yank their seedlings, within five years powerful ailanthus roots are heaving up sidewalks and wreaking havoc in sewers.

which statement best explains how irony is used in the passage?

a. tree that is perceived negatively by urban landscapers provides a reliable source of shade.
b. species of tree imported from china has become naturalized to the extent that it has become a pest.
c. tree that has destructive tendencies manages to take root in the unlikeliest of places.
d. weed tree that wreaks havoc on the environment is referred to favorably as the "tree-of-heaven."