Final answer:
By the 1950s, movie scores often included or were comprised of Folk ballads, like in the films High Noon and Three Coins in the Fountain.
Step-by-step explanation:
By the 1950s, many movie scores included or largely consisted of d) Folk ballads, such as "Do Not Forsake Me, Oh My Darlin'" (sung by Tex Ritter in High Noon) and the title songs from Three Coins in the Fountain (1954), Love Is a Many-Splendored Thing (1955), and Around the World in Eighty Days (1956). These songs became popular and are still remembered for their strong melodies and storytelling lyrics, which captured the spirit of the films they accompanied.