According to the passage, gramophones were ineffective because they A. got out of synchronization with the picture. B. were too large for most movie theaters. C. were newly invented and still
According to the passage, gramophones were ineffective because they
A. got out of synchronization with the picture.
B. were too large for most movie theaters.
C. were newly invented and still had imperfections
D. changed speeds when the needle jumped.