Final answer:
Everyone in the car got quiet due to the unexpected honking of two cars arriving, which caused a moment of tension and a unified reaction from the characters as they hurried outside.
Step-by-step explanation:
In the context of this scenario from the book Bud, Not Buddy, everyone in the car likely got quiet due to a sudden interruption or unexpected event, which is indicated by the honking of two cars arriving. The honking represents an external stimulus that draws everyone's attention, triggering a universal response of silence as the characters process the new information. The quietness could also signal a moment of tension or anticipation among the characters, reflecting their emotional responses to events unfolding outside.
Since the text refers to the characters, Marjorie and Bernice, being 'astounded, half-angry, half-afraid' and reacting to the honking by gasping and hurrying outside side by side, it suggests a pivotal moment that causes a unified reaction amongst the group. Moments like these in literature are effective in capturing the reader's attention and highlighting key plot points that impact the characters' actions and emotions.