3. the odometer gauge indicates the
a. total number of miles your car has been driven
b. fuel level in the car's fuel tank
c. engine revolutions per minute
d. speed in miles per hour

we know that

The word odometer derives from the Greek hodós, which means "trajectory", "way" or "measure". An odometer is a device used to measure the distance traveled by a car. The result of this measurement appears on the instrument panel of your car and can be mechanical or digital.

see the attached figure to better understand the question

therefore

the answer is the option

A. total number of miles your car has been driven

be more specific with your question.