Answer:
B. Quickly
Step-By-Step Explanation:
An idiom is a figure of speech where the word is used to mean something else other than its literal meaning. A track team is a racing team. To qualify for this team, you have to be very fast. Instead of using the word "quickly," breakneck was used to add interest to the writing on convey a certain mood. It is an idiom because it doesn't literally mean breaking necks.
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