Question

what is a breathalyzer?
a tool to test drivers blood
alcohol content
a tool that measures oxygen levels
in breath
a tool that helps the elderly breathe
a tool that helps the police breathe
after running

Explanation:

A breathalyzer is a device used to estimate blood alcohol content (BAC) by analyzing a person's breath, commonly used by law enforcement to test drivers for intoxication. The correct option aligns with this core function.

Answer:

a tool to test drivers' blood alcohol content