Many films from the early 1900s have been lost. These losses include several films by the first wave of Black women, filmmakers. We know about these lost movies only from small pieces of evidence. For example, an advertisement for Jennie Louise Touissant Welcome's documentary Doing Their Bit still exists. There's a reference in a magazine to Tressie Souders's film A Woman's Error. And Maria P. Williams's The Flames of Wrath is mentioned in a letter and a newspaper article, and one image from the movie was discovered in the 1990s.

Which choice best describes the overall structure of the text?