Answer:
(B) The idea wasn't invented until 1935.
Explanation:
The best answer would be (B), since prior to that year, all movies were silent ones. Silent movies are movies without any sound, which started since the late 19th century until they early 20th century.
Though by 1927 movies were already released with sounds, such as the musical The Jazz Singer, none were composed specifically for each movie.
WIth Max Steiner's film score for King Kong, the trend starts, however. King Kong was released in 1933, and after the release more movies had their own film scores. 1935 was also the year when Academy Awards started giving awards for Best Original Film Score.
II and IV only
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Which war is the question asking about
