Which of the following sentences is punctuated correctly?()
A、It seems a shame that a dilligent, sincere politician like David should be ignored by shallow and thoughtlessly fickle voters.
B、It seems a shame that a dilligent sincere politician like David should be ignored by shallow and thoughtlessly fickle voters.
C、It seems a shame that a dilligent, sincere politician like David should be ignored by shallow, and thoughtlessly fickle voters.
D、None of the above.