Which excerpt from "Marian Anderson Sings" best supports the idea that Anderson witnessed a positive shift in attitude of many Americans towards African Americans? "'I had a feeling that a great wave of good will poured out from these people, almost engulfing me.'"

"To sing at the Lincoln Memorial would be a bold political statement."

"Of all who gathered that day at the Lincoln Memorial, no one could have been moved more deeply than Marian Anderson."

"The First Lady, Eleanor Roosevelt, even resigned from the DAR in protest, making front-page headlines all over the country."

One of the author's purposes in the code book is to explain different types of codebreaking to his readers. which line best demonstrates this purpose? a theoretical breakthrough would be a fundamentally new way of finding alice's private key mathematicians have been studying factoring for centuries, and modern factoring techniques are not significantly better than ancient techniques a more recent development is the so-called tempest attack, which aims to detect the electromagnetic signals emitted in a computer's display unit if scientists could build a quantum computer, it would be able to perform calculations with enormous speed mark this and return save and exit next submit