The correct answer is true.
It is true that the success of white rock-and-roll artists brought the music style of rock and roll along with its African American influences to the forefront of popular culture.
Black musicians developed rock and roll music after the great Blues singers and sound of the Delta in Mississippi and Chicago. But it was until white musicians and artist began to play rock and roll, that this genre becomes popular in all the United States. Elvis Presley changed the face of rock and roll. His image of a pretty boy, his dance moves and the quality of his shows opened the door for many artist that followed.