Answer is C.
Let A = Shostakovich's Seventh Symphony
Let A' = known as the "Leningrad" Symphony
Let B = composed at the outset of World War Two
Let C = the composer a hero to the Soviet people who embraced the work as a symbol of heroic resistance to Nazism
Shostakovich's Seventh Symphony, which is known as the "Leningrad" Symphony, was composed at the outset of World War Two, made the composer a hero to the Soviet people who embraced the work as a symbol of heroic resistance to Nazism.
A)which is known as the "Leningrad" Symphony, was composed at the outset of World War Two, made
A, which is A', was B, made C
B) known as the "Leningrad" Symphony, composed at the outset of World War Two, and made
A, A', B, and made C.
C) which is known as the "Leningrad" Symphony, was composed at the outset of World War Two and made
A, which is A', was B and made C.
D) known as the "Leningrad" Symphony and was composed at the outset of World War Two, and made
A, A' and was B, and made C.
E) known as the "Leningrad" Symphony, which was composed at the outset of World War Two, and made
A, A', which was B, and made C.
Sorry, this might not be the best way to give explanations for SC...