Final answer:
Nathanael Henchman likely sent his letter to the Boston Evening-Post to ensure it reached a wider audience and engaged with the public on important issues.
Step-by-step explanation:
Nathanael Henchman might have chosen to send his letter to the Boston Evening-Post instead of directly to George Whitefield likely because he wanted a wider audience to read his message. Given the context of the era and the nature of public discourse at that time, option A) He wanted a wider audience to read his message is the most plausible reason. During that period, public figures often used newspapers as a platform to reach a broader segment of the population, to spark public conversation, and to potentially influence public opinion. Sending letters to newspapers allowed not only for direct communication with the intended recipient but also engagement with the public on issues deemed important.