When stride pianists take turns trying to outplay one another in speed, technique, and style, they are

What common practice of early photographers, which seems problematic today, did not concern nineteenth century viewers?

A. Subjects were required to sit for extremely long exposure times. B. Developments in photography were commercially motivated. C. The chemicals used in photography were extremely toxic. D. Documentary photographs were sometimes staged.

There is almost no documentary evidence of the music being made in Europe around the year 1000

Indicate whether the statement is true or false