Which of the Following Statements About the Introduction of Synchronized

Which of the following statements about the introduction of synchronized sound in the late 1920s is NOT correct?

A) Though The Jazz Singer (1927) is sometimes referred to as the first talkie, Don Juan (1926) had some prerecorded sound.
B) Fierce competition between film companies such as MGM and Warner Bros. delayed the industry-wide adoption of sound.
C) At first, sound actually represented a setback from the silent era, with its rich visual storytelling.
D) Early in the sound era, cameras and microphones could not be moved easily, and this made for static scenes and staging.