Based on the observations Natalie Curtis made about the Navajo people and their songs, which idea best describes how the singers performed the songs?

A. The songs were performed with large groups of men who would make changes to the songs each time they were sung.
B. The songs were performed with loud voices and wild gestures that would emphasize the main ideas of the songs.
C. The songs were performed with an open scroll on the singers’ laps, from which they read all the words as written.
D. The songs were performed with the singers’ eyes closed so they could focus on the words and preserve every detail.