Which is the first e-book?*1 pointThe U.S. Declaration of IndependenceDynaTextAfternoonIndex Thomisticus

The first e-book is widely considered to be The Declaration of Independence by the United States, which was digitized by Michael S. Hart in 1971. This event marked the start of the Project Gutenberg initiative, which was aimed at making literary works and historical documents available in digital format.

While DynaText and Afternoon are notable advancements in the realm of electronic publishing and hypertext systems, they were developed later than the digitization of the U.S. Declaration of Independence. The Index Thomisticus, created by Jacques Maritain, is another significant work, but it also falls under later developments.

Thus, among the options provided, the U.S. Declaration of Independence can be classified as the first e-book.