Answer :
Final answer:
The song "As Time Goes By" from the film Casablanca was written by Herman Hupfeld, not the other listed composers or performers, hence the correct answer is 4) Herman Hupfeld.
Explanation:
The most important diegetic music in Casablanca (1942) is "As Time Goes By", which is a classic song central to the film's romantic and nostalgic atmosphere. This song was written by Herman Hupfeld, not by Bernard Herrmann, Max Steiner, or Dooley Wilson, who are associated with other musical roles or performances within the industry.
Herman Hupfeld originally composed the song in 1931, and it was included in the 1942 film where it played a pivotal role in connecting the characters and evoking the themes of lost love and the persistent passage of time.