Final answer:
The song that Bonnie and her friends sang on the car ride to the Mariners game was not specified, but a popular song often sung during car rides to sports games is 'We Will Rock You' by Queen, known for its stomping and clapping beat.
Step-by-step explanation:
The song that Bonnie and her friends sang at the top of their lungs on the car ride to the Mariners game was likely not specified in the given information. However, one popular song that is often sung during car rides to sports games is 'We Will Rock You' by Queen. This anthem-like song is known for its repetitive stomping and clapping beat, making it a popular choice for fans to sing along to and show their excitement and support for their team.