<span>The lighter object is in orbit around the heaviest, and the Sun is the heaviest object in the Solar System</span>
I think the answer is d. In the magnetotail. I hope this helps! :)
The answer to your question is "A. a lower frequency of the siren.
Because the person in back of the ambulance will hear a lower frequency of the siren. This is because the waves are stretched out. A longer wavelength results in a lower frequency.