Question

the root chron means time. what does the word chronic mean? happening in a way that is difficult to believe happening in a vexing or disturbing way happening in an official or formal way happening frequently or for a long duration

Explanation:

The root "chron" means time. "Chronic" refers to something that occurs frequently or over a long - term period as it relates to the concept of time. The other options do not relate to the meaning of the root in terms of time.

Answer:

happening frequently or for a long duration