Answer:
1). Showing the kindness exhibited by Spanish missionaries to indigenous peoples of Florida.
Explanation:
The most likely reason for a historian behind finding a Catholic prayer book helpful would be that 'it shows the kindness manifested by Spanish missionaries towards the native peoples of America.' They were extremely motivated and possessed an immense desire to contrive the United States as the plat of pure Christianity and considered the primary way of colonizing the land to be the proliferation of the Catholic church. Thus, option 1 is the correct answer.
