when an ambulance drives past you, are the waves being squished together or spread out?\na squished…

Brief Explanations:

This refers to the Doppler effect. When a sound source (ambulance) moves toward an observer, the sound wavefronts are compressed (squished together), increasing the frequency. As it moves away, waves spread out, but the question refers to when it drives past, and the key observed shift as it approaches (the primary noticeable change) involves squished waves.

Answer:

A. squished together