Because the story would have offended many people, the paper did not print it.
a. coordination
b. subordination
c. parallelism

b. subordination

Explanation:

Subordination is linking two clauses in a sentence so that one clause is subordinate to (or dependent on) another.    

In subordination, a subordinate clause is attached to the main clause with the help of a subordinating conjunction.    

There are many subordinating conjunctions. Because is one of them.

Parallelism in a sentence means using constructions that are grammatically similar or identical in structure. We see none of these similar/identical elements in the sentence.

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