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Comics are usually not considered an art form, they serve a valuable function.
What is the correct way to write this sentence?
A. Comics are usually not considered an art form, so they serve a valuable function.
B. Although comics are usually not considered an art form, they serve a valuable function.
C. Comics are usually not considered an art form they serve a valuable function.
D. Leave as is.
What is b. although comics are usually not considered an art form, they serve a valuable function.