What is the problem with the following​ sentence?
Dickens was a very popular​ novelist, but he had to set a grueling schedule for himself in order to meet his​ public's demands, for many of his novels were​ serialized, so he had to publish a new installment every week.
A.
The sentence uses excessive coordination.
B.
The sentence uses excessive subordination.
C.
The sentence does not have enough independent clauses.
D.
The sentence uses excessive slang.