Final answer:
Euchner describes the audience's reaction as shocked and indignant, which highlights the significance of King's message.
Step-by-step explanation:
Euchner describes the audience's reaction to King's idea of the bad check as shocked and indignant in the passage.
The effect of providing the audience's reaction is to highlight the significance of King's message.
Option A) Euchner describes the audience's reaction as shocked and indignant. The effect is to highlight the significance of King's message.